fix(adblocker): inject scriplets with browser.contentScripts on Firefox

[chrmod]

WARNING: This has to be tested very carefully.

On Firefox, scriptlet injection run into timing issues which makes it impossible to inject certain scriptlets before page scripts.

Examples we try to fix are:

• https://gorhill.github.io/uBlock/tests/scriptlet-injection-filters-1.html
• https://picrew.me

The only way to ensure the scriptlet is always executed before the page script is to use browser.contentScripts API which available on Firefox only.

Open questions:

• is injecting to allFrames safe? for example, can scriptlets from different hostnames be injected due to allFrames?
• do we need more triggering methods like webRequest.onResponseStarted?
• when content scripts should be cleaned?
• do we handle redirects correctly? for example redirect from http://example.com to https://www.example.com ?
• can we speed up by not matching cosmetic filters for scriptlet injection once content scripts are registered?

TODO:

• support selective blocking

[github-actions]

Builds for commit 05fd0a5:

• ghostery-chromium-10.4.15-05fd0a5
• ghostery-firefox-10.4.15-05fd0a5

[github-actions]

Builds for commit 05fd0a5:

• ghostery-chromium-10.4.15-05fd0a5
• ghostery-firefox-10.4.15-05fd0a5

[github-actions]

Builds for commit ded4f50:

• ghostery-chromium-10.4.15-ded4f50
• ghostery-firefox-10.4.15-ded4f50

[github-actions]

Builds for commit d589cb3:

• ghostery-chromium-10.4.15-d589cb3
• ghostery-firefox-10.4.15-d589cb3

[github-actions]

Builds for commit 4ad49a1:

• ghostery-chromium-10.4.15-06defed
• ghostery-firefox-10.4.15-06defed

[github-actions]

Builds for commit 4ad49a1:

• ghostery-chromium-10.4.15-4ad49a1
• ghostery-firefox-10.4.15-4ad49a1

[philipp-classen]

I'm wondering if this part of the code is necessary or how it should be best handled.
When the engine updates, it should automatically clear the content scripts (contentScripts.unregisterAll). There might be potential for race conditions, but in principle, it should eventually take care of unregistering.

Is the code here intended especially for pause (which won't trigger an engine reload)? If so, would be good to leave a comment explaining this.

[github-actions]

Builds for commit b63b226:

• ghostery-chromium-10.4.15-b63b226
• ghostery-firefox-10.4.15-b63b226

[GRadziejewski]

Tested version: #2074 (comment)

Checked on:

Windows 11, Firefox 132.0.2, GBE 10.4.15 and 10.4.10
Windows 10, Firefox 132.0.2, GBE 10.4.15 and 10.4.10

Websites:

https://example.com/ - OK
https://stre4mplay.one/ - OK
https://www.officedepot.com/ - OK
https://picrew.me/ja/ - OK
https://www.foxbusiness.com/ - OK
https://edition.cnn.com/ - OK
https://www.br.de/index.html - OK
https://indeed.com/ - OK
https://pasteboard.co/ - OK
https://los40.com/ - OK
https://www.telegraph.co.uk/ - OK
https://www.verizon.com/ - On 10.4.10 version it's not working, on 10.4.15 it's working!
https://humanbenchmark.com/ - OK
https://www.politico.com/ - OK
https://kusonime.com/ - OK
https://modapk.link/ - OK
https://xxxymovies.com/ - OK
https://www.jetpunk.com/ - OK
https://imgur.com/ - OK
https://www.hentai-party.net/ - OK
https://ccurl.net/ - OK
https://mysexgames.com/ - OK
https://www.ancient-origins.net/ - OK
https://hideandseek.world/ - OK
https://pewgame.com/ - OK
https://haonguyen.top/ - OK
https://crazyblog.in/ - OK
https://cutearn.net/ - OK
rshrt.com - > https://reshort.com/ - OK
https://gplinks.org/ - OK
https://easysky.in/ - OK
https://veganab.co/ - OK
https://www.gyanitheme.com/ - OK
https://fitdynamos.com/ - OK
https://postazap.com/ - OK
https://blog24.me/ - OK
https://atglinks.com/ - OK
https://streamelements.com/ - OK
https://www.facebook.com - OK
https://infinityscans.xyz/ - OK
https://www.youtube.com/ - OK

LGTM