Migrate to Manifest v3

[MikkCZ]

The timeline when v3 is supported in all browsers (mainly Firefox ESR) and when they plan to deprecate the current version is still not clear.

Start by updating the background script to work as non persistent, which should also improve performance.

[MikkCZ]

Chrome Web Store will not support submissions of new extensions with v2 after January 17, 2022. There is no date for complete deprecation of v2, but it's definitely coming.

[MikkCZ]

• https://extensionworkshop.com/documentation/develop/manifest-v3-migration-guide/
• https://developer.chrome.com/docs/extensions/mv3/intro/
• https://developer.chrome.com/docs/extensions/mv2/background_migration/

[MikkCZ]

I opened a blocker on Pontoon side, because manifest v3 will remove webRequest API, that is needed to support containers (aka contextual identities) in Firefox.

However today I found (and sorry for my negligence), that supposedly Firefox will keep the webRequest API for manifest v3. If that's true, there would be no regression, because in Chrome the containers are not available anyway.

[MikkCZ]

How to work with workers in Webpack - https://github.com/webpack/webpack/blob/main/examples/worker/example.js.

[MikkCZ]

• https://extensionworkshop.com/documentation/develop/manifest-v3-migration-guide/
• https://developer.chrome.com/docs/extensions/develop/migrate
• https://blog.mozilla.org/addons/2024/03/13/manifest-v3-manifest-v2-march-2024-update/
• https://github.com/GoogleChromeLabs/extension-manifest-converter