[meta] MV3 upstream issues

[asamuzaK]

• Blink:
  • 1339382 - Implement offscreen documents for MV3 extensions - chromium
    See also:
    • Proposal: Offscreen Documents for Manifest V3 · Issue #170 · w3c/webextensions
    • Allowing Extensions to Open Off-Screen Documents in Manifest V3 (public)
    • chrome.offscreen - Chrome Developers
  • 1064671 - Service Worker-based extensions cannot load SVG image files. - chromium
    Fixed by Prepare png files for Blink #147.
    See also:
    • 1056354 - Allow some level of DOM parsing in service workers - chromium
    • 29683 - Extension icons should support SVG - chromium
    • 893175 - Light and Dark Mode Icons for Extensions - chromium
    • Extension Icon Design for Light/Dark/Custom Theme on Browser Toolbar · Issue #229 · w3c/webextensions
    • 1353252 - manifest v3: chrome.notifications.create() doesn't support svg file for iconUrl - chromium

[asamuzaK]

Ref Chrome Extensions Manifest V2 support timeline - Chrome Developers
Ref Pausing Manifest V2 phase-out changes

[asamuzaK]

For a note: 1811443 - Support type: "module" (event page, not background service worker)

[asamuzaK]

Ref

• Offscreen Documents in Manifest V3 - Chrome Developers
• chrome.offscreen - Chrome Developers

[asamuzaK]

Ref chrome-extensions-samples/functional-samples/cookbook.offscreen-clipboard-write at main · GoogleChrome/chrome-extensions-samples

[asamuzaK]

Personal note

SVG icons are unlikely to be available:

• It should not be considered a blocker for migrating to MV3.
• Even if you migrate to MV3, you still need to prepare two manifest.json as before.
  action, background, icons and permissions need to be prepared for Blink.

Writing to clipboard:

• Separate function to another file and import it.
• Prepare replacement file for blink and include it at build time.

[asamuzaK]

Chrome cannot load SVG icons programmatically in MV3.
1353252 - manifest v3: chrome.notifications.create() doesn't support svg file for iconUrl - chromium
This would be a blocker unless remove icon support for Blink browsers.

Due to this issue, reverted MV3 migration for Gecko at the moment.