MV2 vs MV3 in Chrome and Firefox

[Jackie Han]

I just read the blog from Firefox: Manifest v3 in Firefox: Recap & Next Steps (2022/5/18)

Here is a simple comparison:

	Chrome MV2	Chrome MV3	Firefox MV2	Firefox MV3
Network	WebRequest	declarativeNetRequest	WebRequest	WebRequest + declarativeNetRequest
Background	persistent bg page + event page	service worker	persistent bg page, event page(introduced from FF MV3)	(limited) event page, service worker(in working)

Jackie Han

[Cuyler Stuwe]

Did Firefox uh... forget to add content script support?! 🤔😅

I tried porting two simple MV3 extensions to Firefox (following their migration guide) and wasn't able to get any of the content scripts to work.

The only "trick" I could do to get them to be recognized was:
1. Change the manifest_version to 2 and load the extension like this.
2. Change the manifest_version back to 3.
3. Reload in-place in about:debugging.

[Jackie Han]

Here is MV3 in Safari (2022/6/8)

https://developer.apple.com/videos/play/wwdc2022/10099/