Publish minutes of 2026-04-07 - 2026-04-09 F2F meetings in London

[Rob--W]

Generated from https://docs.google.com/document/d/1LLa1rXT00ESnY26-XskmIAaBPxxAmsqLg_E6ynZec8Q/edit using the tool and process from #105.

The WECG met in-person for three days on 2026-04-07 until 2026-04-09 (#951, https://github.com/w3c/webextensions/wiki/2026-London-F2F-Coordination). We discussed 54 issues/PRs and topics without issue. This PR adds the minutes of the discussed topics on these days.

Tuesday, 7 april 2026

Discussed or mentioned issues: #138, #353, #836, #970, #128, #898, #27, #273, #1, #139, #279, #284, #616, #815, #112, #148, #755

Agenda of _minutes/2026-04-07-london-f2f.md:

• Kickoff
• Secure Storage API
• onDisabled Events
• Data persistence
• Cross-browser testing
• Sidebar
• Click-jacking Protection
• Triage #0
  • Issue 898: Add a way to synthesize user gesture on a page as extension
  • Issue 27: tabs.duplicate() must implement a way to duplicate at a given index and with a given active state
  • Issue 273: Inconsistency: path handling across APIs and browsers
  • Issue 1: What to do with the older CG?
  • Issue 128: Proposal: agree on a unified sidebar API for mv3
  • Issue 139: Do not outlaw dynamic code
  • Issue 616: Content script injection inconsistencies in the sidePanel
  • Issue 815: Inconsistency: Retrieving closed shadow roots
  • Issue 112: Add an API to trigger extension update
  • Issue 148: Proposal: allow webRequest with background.persistent: false / SW
  • Issue 755: Proposal: about: matching

Wednesday 8 april 2026

Discussed or mentioned issues #284, #483, #896, #169, #557, #12, #862, #539, #673, #878, #319, #172, #785, #189, #399, #8 and PRs #679, #678, #793, #934, #676.

Agenda of _minutes/2026-04-08-london-f2f.md:

• Cross-world extension messaging
• Synchronous properties for content scripts
• ML/AI
• Embedding websites in extension pages
• Synchronous properties for content scripts (continued)
• Triage #1
  • Issue 557: Proposal: Extension Loading Priority
  • Issue 12: request: allow to retrieve a frameID from an <iframe> element
  • PR 934: Add runtime.getDocumentId() proposal
  • Issue 862: Proposal: Add sound to contentSettings.
  • Issue 539: Proposal: RegisteredContentScript.tabIds and RegisteredContentScript.excludeTabIds properties to filter injection
  • Issue 673: Use match_origin_as_fallback behavior by default in scripting.executeScript
  • Issue 878: Proposal: runtime.getVersion() method
  • Issue 319: Increase the maximum number of dynamic rules to 30,000
  • PR 676: Proposal: Public Suffix API
  • Issue 172: Proposal: runtime.isFirstInstalled
  • Issue 785: Proposal: create _generated_service_worker.js based on background.scripts
  • Issue 189: Inconsistency: It must be available for iOS
  • Issue 399: setUninstallURL length update
  • Issue 8: executeScript API may inject scripts in an unexpected target at runtime
• Cross-browser extension mapping

Thursday 9 april 2026

Discussed or mentioned issues #284, #475, #138, #617, #231, #732, #976, #461, #338 and PRs #793, #799, #837, #676, #370, #791, #822, #75, #975, #893, #942.

Agenda of _minutes/2026-04-09-london-f2f.md:

• State of the browsers
  • Mozilla Firefox
  • Apple Safari
  • Microsoft Edge
  • Google Chrome
  • Q&A
• Extension Origins
• Main World Shared Params
• Synchronous data at startup
• WebExt Types
• runtime.onInvalidated reasons
• Pull request and issue triage
  • PR 799: Add browser.permissions.canAccess() proposal
  • PR 837: Proposal: close() Method for the sidePanel API
  • PR 676: Proposal: Public Suffix API
  • PR 370: Initial Firefox schemas, 2023Q1
  • PR 791: Add trial_tokens key to specification
  • PR 822: Proposal: privacy.websites.thirdPartyCookiesAccessible
  • Issue 75: Standardize Firefox exportFunction() and cloneInto()
  • PR 975: Update runtime.onInvalidated with unload reason and isolated world restriction
  • Issue 893: Web request tainting (Collusion/Lightbeam)
  • Issue 732: Proposal: Add permanentNodeType property to BookmarkTreeNode
  • Issue 976: Add manifest key to allow devtools_page to run when inspecting service worker contexts
  • Issue 461 Proposal: webRequest worklets
  • PR 942: Proposal: i18n.getAvailableLanguages()
  • Issue 338: Inconsistency: runtime.onMessage Promise return
• Regular WECG meeting

All referenced issues and PRs

List of covered topics, issue numbers + titles

Tuesday, 7 april 2026

• Proposal: let content scripts listen for event to detect when the extension is unloaded (for various reasons) #138
• Support onEnabled event when the extension from disabled state to enabled state #353
• Allow extensions to track their own disable/uninstall events #836
• Should disabled extensions have their runtime.setUninstallURL opened on uninstall? #970
• Proposal: agree on a unified sidebar API for mv3 #128
• Add a way to synthesize user gesture on a page as extension #898
• tabs.duplicate() must implement a way to duplicate at a given index and with a given active state #27
• Inconsistency: path handling across APIs and browsers #273
• What to do with the older CG?  #1
• Do not outlaw dynamic code #139
• User scripts in Manifest V3 #279
• Main world Content Script shared params #284
• Content script injection inconsistencies in the sidePanel #616
• Inconsistency: Retrieving closed shadow roots #815
• Add an API to trigger extension update #112
• Proposal: allow webRequest with background.persistent: false / SW #148
• Proposal: about: matching #755

Wednesday, 8 april 2026

• Main world Content Script shared params #284
• Proposal: API to embed pages in WebExtension bypassing CSP #483
• There is no HTTP Referer header for iframe in an extension page #896
• Blocking webRequest usecase - add, modify and remove CSP directives  #169
• Proposal: Extension Loading Priority #557
• request: allow to retrieve a frameID from an <iframe> element #12
• Proposal: Add sound to contentSettings. #862
• Proposal: RegisteredContentScript.tabIds and RegisteredContentScript.excludeTabIds properties to filter injection #539
• Use match_origin_as_fallback behavior by default in scripting.executeScript #673
• Proposal: runtime.getVersion() method #878
• Increase the maximum number of dynamic rules to 30,000 #319
• Proposal: runtime.isFirstInstalled #172
• Proposal: create _generated_service_worker.js based on background.scripts #785
• Inconsistency: It must be available for iOS #189
• setUninstallURL length update #399
• executeScript API may inject scripts in an unexpected target at runtime #8
• Proposal: dom.createPort() #679
• Proposal: dom.execute() #678
• Add proposal: Synchronous data at startup #793
• Add runtime.getDocumentId() proposal #934
• Proposal: Public Suffix API #676

Thursday, 9 april 2026

• Main world Content Script shared params #284
• Proposal: StorageArea.onChanged filters #475
• Proposal: let content scripts listen for event to detect when the extension is unloaded (for various reasons) #138
• manifest key to enable automatic injection of content scripts after installation/update #617
• Extension API to find the public suffix (eTLD) of a given URL/domain #231
• Proposal: Add permanentNodeType property to BookmarkTreeNode #732
• Add manifest key to allow devtools_page to run when inspecting service worker contexts #976
• Proposal: webRequest worklets #461
• Inconsistency: runtime.onMessage Promise return #338
• Add proposal: Synchronous data at startup #793
• Add browser.permissions.canAccess() proposal #799
• Proposal: close() Method for the sidePanel API #837
• Proposal: Public Suffix API #676
• Initial Firefox schemas, 2023Q1 #370
• Add trial_tokens key to specification #791
• Proposal: privacy.websites.thirdPartyCookiesAccessible #822
• Standardize Firefox exportFunction() and cloneInto() #75
• Update runtime.onInvalidated with unload reason and isolated world restriction #975
• Web request tainting (Collusion/Lightbeam) #893
• Proposal: i18n.getAvailableLanguages() #942

[oliverdunk]

I haven't had a chance to read over all of this, but I don't believe we made any notes that shouldn't be public, so approving.