Firefox is absolutely fantastic nowadays, and I strongly encourage everyone to start using it as their primary browser. It's hard to overstate how important it is to have at least two independent browser implementations around. If Firefox dies then Chromium would become the de facto rendering engine, and we'll no longer have any meaningful specification for web standards. The web will simply be whatever Chromium does…
>After discussing this with several content blocking extension developers, we have decided to implement DNR and continue maintaining support for blocking webRequest
Then they say blockingWebRequest will be eventually deprecated:
>We’d like to note that it’s still very early to be talking about migrating extensions to Manifest v3. We have not yet set a deprecation date for Manifest v2 but expect it to be supported for at least one year after Manifest v3 becomes stable in the release channel.
https://blog.mozilla.org/addons/2021/05/27/manifest-v3-updat...