tab-new crashes in attach --extension sessions with TypeError reading _page #373

Closed
microsoft/playwright
#40678
Closed
tab-new crashes in attach --extension sessions with TypeError reading _page#373
microsoft/playwright
#40678

Description

@jianzhangg
jianzhangg (jianzhangg)
opened on Apr 22, 2026

Summary

tab-new fails in an attach --extension=msedge session with:

TypeError: Cannot read properties of undefined (reading '_page')

This does not reproduce in a normal open session on the same machine.

Version

  • @playwright/cli: 0.1.8
  • OS: macOS 15.7.4
  • Browser: Microsoft Edge (attached via extension)

Repro

  1. Attach to a running Edge session via extension:
playwright-cli -s=pf attach --extension=msedge
  1. Confirm the session is alive:
playwright-cli -s=pf tab-list

Example output:

### Result
- 0: (current) [森果云-批发易](http://pfzone.senguo.me:3009/easy/private/salesman)
  1. Try to create a new tab:
playwright-cli -s=pf tab-new

or:

playwright-cli -s=pf tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'

Actual result

Both commands fail immediately with:

### Error
TypeError: Cannot read properties of undefined (reading '_page')

Expected result

tab-new should create a new tab in the attached session, the same way it does in a normal open session.

Control case

The same command works in a non-attach session:

playwright-cli -s=cmp open --browser=msedge 'http://pfzone.senguo.me:3009/easy/private/salesman'
playwright-cli -s=cmp tab-new
playwright-cli -s=cmp tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'

In that case, new tabs are created successfully.

Notes

  • I also tried attach --cdp=msedge, but on this machine remote debugging was not enabled, so I could not compare CDP attach behavior yet.
  • This looks specific to attach --extension rather than a general tab-new failure.

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      , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
       blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

      Skip to content
      tab-new crashes in attach --extension sessions with TypeError reading _page #373
      Closed
      microsoft/playwright
      #40678
      Closed
      tab-new crashes in attach --extension sessions with TypeError reading _page#373
      microsoft/playwright
      #40678
      Description
      @jianzhangg
      jianzhangg (jianzhangg)
      opened on Apr 22, 2026
      Summary
      tab-new fails in an attach --extension=msedge session with:
      TypeError: Cannot read properties of undefined (reading '_page')

      This does not reproduce in a normal open session on the same machine.
      Version
      • @playwright/cli: 0.1.8
      • OS: macOS 15.7.4
      • Browser: Microsoft Edge (attached via extension)
      Repro
      1. Attach to a running Edge session via extension:
      playwright-cli -s=pf attach --extension=msedge
      1. Confirm the session is alive:
      playwright-cli -s=pf tab-list
      Example output:
      ### Result
- 0: (current) [森果云-批发易](http://pfzone.senguo.me:3009/easy/private/salesman)

      1. Try to create a new tab:
      playwright-cli -s=pf tab-new
      or:
      playwright-cli -s=pf tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
      Actual result
      Both commands fail immediately with:
      ### Error
TypeError: Cannot read properties of undefined (reading '_page')

      Expected result
      tab-new should create a new tab in the attached session, the same way it does in a normal open session.
      Control case
      The same command works in a non-attach session:
      playwright-cli -s=cmp open --browser=msedge 'http://pfzone.senguo.me:3009/easy/private/salesman'
playwright-cli -s=cmp tab-new
playwright-cli -s=cmp tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
      In that case, new tabs are created successfully.
      Notes
      • I also tried attach --cdp=msedge, but on this machine remote debugging was not enabled, so I could not compare CDP attach behavior yet.
      • This looks specific to attach --extension rather than a general tab-new failure.
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        No labels
        No labels
        Type
        No type
        Projects
        No projects
          Milestone
          No milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

          Skip to content
          tab-new crashes in attach --extension sessions with TypeError reading _page #373
          Closed
          microsoft/playwright
          #40678
          Closed
          tab-new crashes in attach --extension sessions with TypeError reading _page#373
          microsoft/playwright
          #40678
          Description
          @jianzhangg
          jianzhangg (jianzhangg)
          opened on Apr 22, 2026
          Summary
          tab-new fails in an attach --extension=msedge session with:
          TypeError: Cannot read properties of undefined (reading '_page')

          This does not reproduce in a normal open session on the same machine.
          Version
          • @playwright/cli: 0.1.8
          • OS: macOS 15.7.4
          • Browser: Microsoft Edge (attached via extension)
          Repro
          1. Attach to a running Edge session via extension:
          playwright-cli -s=pf attach --extension=msedge
          1. Confirm the session is alive:
          playwright-cli -s=pf tab-list
          Example output:
          ### Result
- 0: (current) [森果云-批发易](http://pfzone.senguo.me:3009/easy/private/salesman)

          1. Try to create a new tab:
          playwright-cli -s=pf tab-new
          or:
          playwright-cli -s=pf tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
          Actual result
          Both commands fail immediately with:
          ### Error
TypeError: Cannot read properties of undefined (reading '_page')

          Expected result
          tab-new should create a new tab in the attached session, the same way it does in a normal open session.
          Control case
          The same command works in a non-attach session:
          playwright-cli -s=cmp open --browser=msedge 'http://pfzone.senguo.me:3009/easy/private/salesman'
playwright-cli -s=cmp tab-new
playwright-cli -s=cmp tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
          In that case, new tabs are created successfully.
          Notes
          • I also tried attach --cdp=msedge, but on this machine remote debugging was not enabled, so I could not compare CDP attach behavior yet.
          • This looks specific to attach --extension rather than a general tab-new failure.
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            No labels
            No labels
            Type
            No type
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              tab-new crashes in attach --extension sessions with TypeError reading _page #373
              Closed
              microsoft/playwright
              #40678
              Closed
              tab-new crashes in attach --extension sessions with TypeError reading _page#373
              microsoft/playwright
              #40678
              Description
              @jianzhangg
              jianzhangg (jianzhangg)
              opened on Apr 22, 2026
              Summary
              tab-new fails in an attach --extension=msedge session with:
              TypeError: Cannot read properties of undefined (reading '_page')

              This does not reproduce in a normal open session on the same machine.
              Version
              • @playwright/cli: 0.1.8
              • OS: macOS 15.7.4
              • Browser: Microsoft Edge (attached via extension)
              Repro
              1. Attach to a running Edge session via extension:
              playwright-cli -s=pf attach --extension=msedge
              1. Confirm the session is alive:
              playwright-cli -s=pf tab-list
              Example output:
              ### Result
- 0: (current) [森果云-批发易](http://pfzone.senguo.me:3009/easy/private/salesman)

              1. Try to create a new tab:
              playwright-cli -s=pf tab-new
              or:
              playwright-cli -s=pf tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
              Actual result
              Both commands fail immediately with:
              ### Error
TypeError: Cannot read properties of undefined (reading '_page')

              Expected result
              tab-new should create a new tab in the attached session, the same way it does in a normal open session.
              Control case
              The same command works in a non-attach session:
              playwright-cli -s=cmp open --browser=msedge 'http://pfzone.senguo.me:3009/easy/private/salesman'
playwright-cli -s=cmp tab-new
playwright-cli -s=cmp tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
              In that case, new tabs are created successfully.
              Notes
              • I also tried attach --cdp=msedge, but on this machine remote debugging was not enabled, so I could not compare CDP attach behavior yet.
              • This looks specific to attach --extension rather than a general tab-new failure.
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                No labels
                No labels
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

                  Skip to content
                  tab-new crashes in attach --extension sessions with TypeError reading _page #373
                  Closed
                  microsoft/playwright
                  #40678
                  Closed
                  tab-new crashes in attach --extension sessions with TypeError reading _page#373
                  microsoft/playwright
                  #40678
                  Description
                  @jianzhangg
                  jianzhangg (jianzhangg)
                  opened on Apr 22, 2026
                  Summary
                  tab-new fails in an attach --extension=msedge session with:
                  TypeError: Cannot read properties of undefined (reading '_page')

                  This does not reproduce in a normal open session on the same machine.
                  Version
                  • @playwright/cli: 0.1.8
                  • OS: macOS 15.7.4
                  • Browser: Microsoft Edge (attached via extension)
                  Repro
                  1. Attach to a running Edge session via extension:
                  playwright-cli -s=pf attach --extension=msedge
                  1. Confirm the session is alive:
                  playwright-cli -s=pf tab-list
                  Example output:
                  ### Result
- 0: (current) [森果云-批发易](http://pfzone.senguo.me:3009/easy/private/salesman)

                  1. Try to create a new tab:
                  playwright-cli -s=pf tab-new
                  or:
                  playwright-cli -s=pf tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
                  Actual result
                  Both commands fail immediately with:
                  ### Error
TypeError: Cannot read properties of undefined (reading '_page')

                  Expected result
                  tab-new should create a new tab in the attached session, the same way it does in a normal open session.
                  Control case
                  The same command works in a non-attach session:
                  playwright-cli -s=cmp open --browser=msedge 'http://pfzone.senguo.me:3009/easy/private/salesman'
playwright-cli -s=cmp tab-new
playwright-cli -s=cmp tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
                  In that case, new tabs are created successfully.
                  Notes
                  • I also tried attach --cdp=msedge, but on this machine remote debugging was not enabled, so I could not compare CDP attach behavior yet.
                  • This looks specific to attach --extension rather than a general tab-new failure.
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    No labels
                    No labels
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                      Skip to content
                      tab-new crashes in attach --extension sessions with TypeError reading _page #373
                      Closed
                      microsoft/playwright
                      #40678
                      Closed
                      tab-new crashes in attach --extension sessions with TypeError reading _page#373
                      microsoft/playwright
                      #40678
                      Description
                      @jianzhangg
                      jianzhangg (jianzhangg)
                      opened on Apr 22, 2026
                      Summary
                      tab-new fails in an attach --extension=msedge session with:
                      TypeError: Cannot read properties of undefined (reading '_page')

                      This does not reproduce in a normal open session on the same machine.
                      Version
                      • @playwright/cli: 0.1.8
                      • OS: macOS 15.7.4
                      • Browser: Microsoft Edge (attached via extension)
                      Repro
                      1. Attach to a running Edge session via extension:
                      playwright-cli -s=pf attach --extension=msedge
                      1. Confirm the session is alive:
                      playwright-cli -s=pf tab-list
                      Example output:
                      ### Result
- 0: (current) [森果云-批发易](http://pfzone.senguo.me:3009/easy/private/salesman)

                      1. Try to create a new tab:
                      playwright-cli -s=pf tab-new
                      or:
                      playwright-cli -s=pf tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
                      Actual result
                      Both commands fail immediately with:
                      ### Error
TypeError: Cannot read properties of undefined (reading '_page')

                      Expected result
                      tab-new should create a new tab in the attached session, the same way it does in a normal open session.
                      Control case
                      The same command works in a non-attach session:
                      playwright-cli -s=cmp open --browser=msedge 'http://pfzone.senguo.me:3009/easy/private/salesman'
playwright-cli -s=cmp tab-new
playwright-cli -s=cmp tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
                      In that case, new tabs are created successfully.
                      Notes
                      • I also tried attach --cdp=msedge, but on this machine remote debugging was not enabled, so I could not compare CDP attach behavior yet.
                      • This looks specific to attach --extension rather than a general tab-new failure.
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        No labels
                        No labels
                        Type
                        No type
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                          Skip to content
                          tab-new crashes in attach --extension sessions with TypeError reading _page #373
                          Closed
                          microsoft/playwright
                          #40678
                          Closed
                          tab-new crashes in attach --extension sessions with TypeError reading _page#373
                          microsoft/playwright
                          #40678
                          Description
                          @jianzhangg
                          jianzhangg (jianzhangg)
                          opened on Apr 22, 2026
                          Summary
                          tab-new fails in an attach --extension=msedge session with:
                          TypeError: Cannot read properties of undefined (reading '_page')

                          This does not reproduce in a normal open session on the same machine.
                          Version
                          • @playwright/cli: 0.1.8
                          • OS: macOS 15.7.4
                          • Browser: Microsoft Edge (attached via extension)
                          Repro
                          1. Attach to a running Edge session via extension:
                          playwright-cli -s=pf attach --extension=msedge
                          1. Confirm the session is alive:
                          playwright-cli -s=pf tab-list
                          Example output:
                          ### Result
- 0: (current) [森果云-批发易](http://pfzone.senguo.me:3009/easy/private/salesman)

                          1. Try to create a new tab:
                          playwright-cli -s=pf tab-new
                          or:
                          playwright-cli -s=pf tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
                          Actual result
                          Both commands fail immediately with:
                          ### Error
TypeError: Cannot read properties of undefined (reading '_page')

                          Expected result
                          tab-new should create a new tab in the attached session, the same way it does in a normal open session.
                          Control case
                          The same command works in a non-attach session:
                          playwright-cli -s=cmp open --browser=msedge 'http://pfzone.senguo.me:3009/easy/private/salesman'
playwright-cli -s=cmp tab-new
playwright-cli -s=cmp tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
                          In that case, new tabs are created successfully.
                          Notes
                          • I also tried attach --cdp=msedge, but on this machine remote debugging was not enabled, so I could not compare CDP attach behavior yet.
                          • This looks specific to attach --extension rather than a general tab-new failure.
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            No labels
                            No labels
                            Type
                            No type
                            Projects
                            No projects
                              Milestone
                              No milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                              Skip to content
                              tab-new crashes in attach --extension sessions with TypeError reading _page #373
                              Closed
                              microsoft/playwright
                              #40678
                              Closed
                              tab-new crashes in attach --extension sessions with TypeError reading _page#373
                              microsoft/playwright
                              #40678
                              Description
                              @jianzhangg
                              jianzhangg (jianzhangg)
                              opened on Apr 22, 2026
                              Summary
                              tab-new fails in an attach --extension=msedge session with:
                              TypeError: Cannot read properties of undefined (reading '_page')

                              This does not reproduce in a normal open session on the same machine.
                              Version
                              • @playwright/cli: 0.1.8
                              • OS: macOS 15.7.4
                              • Browser: Microsoft Edge (attached via extension)
                              Repro
                              1. Attach to a running Edge session via extension:
                              playwright-cli -s=pf attach --extension=msedge
                              1. Confirm the session is alive:
                              playwright-cli -s=pf tab-list
                              Example output:
                              ### Result
- 0: (current) [森果云-批发易](http://pfzone.senguo.me:3009/easy/private/salesman)

                              1. Try to create a new tab:
                              playwright-cli -s=pf tab-new
                              or:
                              playwright-cli -s=pf tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
                              Actual result
                              Both commands fail immediately with:
                              ### Error
TypeError: Cannot read properties of undefined (reading '_page')

                              Expected result
                              tab-new should create a new tab in the attached session, the same way it does in a normal open session.
                              Control case
                              The same command works in a non-attach session:
                              playwright-cli -s=cmp open --browser=msedge 'http://pfzone.senguo.me:3009/easy/private/salesman'
playwright-cli -s=cmp tab-new
playwright-cli -s=cmp tab-new 'http://pfzone.senguo.me:3009/easy/private/salesman'
                              In that case, new tabs are created successfully.
                              Notes
                              • I also tried attach --cdp=msedge, but on this machine remote debugging was not enabled, so I could not compare CDP attach behavior yet.
                              • This looks specific to attach --extension rather than a general tab-new failure.
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