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For an extension to be entirely declarative, it must package all the scripts to inject anywhere, the scripting.registerContentScript API doesn't allow injecting code as string[1], the content scripts must be part of the package.[2]
There is userScripts API which allows injecting code as string, but it's impractical as in Chromium-based browsers this requires extra steps by the user to enable the API.[3] In Firefox, the documentation for this API has the following note[4]:
> When using Manifest V3 or higher, use scripting.registerContentScripts() to register scripts
* * *
[1] https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...
[2] https://github.com/uBlockOrigin/uBOL-home/tree/main/chromium...
[3] https://developer.chrome.com/docs/extensions/reference/userS... ("Availability Pending")
[4] https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...
> Manifest V3 will stop this by limiting what Google describes "remotely hosted code." All updates, even to benign things like a filtering list, will need to happen through full extension updates through the Chrome Web Store. They will all be subject to Chrome Web Store reviews process, and that comes with a significant time delay.
So the author can't think of any other reason for this change other than to "slow down ad blocker updates"
Well how about stuff like this: https://github.com/extesy/hoverzoom/discussions/670
Where an extension dev details offers to "monetize" his app and basically perform a bait and switch and make it malicious.
https://github.com/webcompat/web-bugs/issues?q=is%3Aopen+is%...
Microsoft Teams (which I don't think many people use voluntarily) in particular breaks in stupid ways - and then in others if you spoof your user agent.
I've edited my comment to also include a link to the Chrome docs, but that FAQ entry also has the link to an issue in the webextensions repository indicating it's a limitation of MV3: https://github.com/w3c/webextensions/issues/112
> Show me these pages that Firefox doesn't render well.
I'm not doing homework for you. Lots of pages don't render well in Firefox, it's a well known issue which is why it comes up in every thread about Firefox.
> Show me pages that tank Firefox performance.
Firefox in general performs poorly. Again, known long-term ongoing issue. Look at this thread where almost every top-level comment is sceptical that Firefox is even close to Chrome in performance: https://news.ycombinator.com/item?id=36770883
You can find ongoing performance benchmarks between Chrome and Firefox here, and it's not flattering for FF: https://arewefastyet.com
> How many of them will have -webkit-* and other engine-exclusive markup/CSS?
I don't care, at all. It's not my job, as a user, to debug performance problems.
> Firefox updates every 6 weeks, just like Chrome.
Ok? I didn't say anything about update cadence.
It's called Sideload XPI, iirc Firefox Nightly allows you to sideload XPI if you enable Experimental by tapping Firefox logo in About 7 times.
But it's easier with Ice Raven or Smart Cookie Web Preview:
- https://old.reddit.com/r/browsers/comments/18ezd3g/iceraven_...
- https://github.com/CookieJarApps/SmartCookieWeb-Preview/rele...