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Google Chrome disables uBlock Origin for some in Manifest v3 rollout
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
I use Firefox as my main browser on Android, and all apps that invoke a WebView do so using Firefox's rendering engine, with uBlock Origin and Dark Reader working seamlessly. So, maybe this info about Firefox for Android lacking WebView support is outdated?
Exemple after clicking a link on Twitter/X: