Mozilla is not implementing[1] any of the Mv3 restrictions against ad blockers (i.e. WebRequest).
[1] https://blog.mozilla.org/addons/2022/05/18/manifest-v3-in-fi...
[1] https://blog.mozilla.org/addons/2022/05/18/manifest-v3-in-fi...
https://github.com/violentmonkey/violentmonkey/issues/1555
https://github.com/Tampermonkey/tampermonkey/issues/644
The only thing we have so far is a google rep stating that they'll "reaffirm that we plan to support userscript managers in Maniest V3 before the Manifest V2 deprecation"[0] back in May, which fills me with no hope at all that they won't simply be killed.
0: https://github.com/Tampermonkey/tampermonkey/issues/644#issu...
It seems like I'm having to disable something or other with every major update of firefox lately, and as long as they continue to let me disable risky features I'll keep using it. Nothing strikes a better balance between useful and secure like hardened a firefox install, but it takes a lot of vigilance and a willingness to add or modify hundreds of about:config options (after installing https://github.com/earthlng/aboutconfig)