This isn’t just their extension, if I am reading this correctly it is any extension(that hasn’t been vetted by Mozilla) is capable of being blocked from running due to this this new quarantined domain list that Firefox 115 has.

However this feature can be disabled, or otherwise overridden at this time by the end user when following the documentation[0].

I can understand the concern here, but this change is being communicated, can be user managed, and the best faith interpretation I can come up with, is in fact for security purposes. It creates restrictions on (at least from Mozilla’s perspective) untrusted extensions. I mean how many extensions are there that do act maliciously? It probably isn’t trivial.

I highly recommend you use a minimum amount of extensions anyway. The OP’s extension is a good one from what I can tell but I really only use uBlock Origin, Bitwarden, and tab containers at this point. I guess whenever I use Gnome I end up having to use their extension too which is frustrating but a different story.

Will have to pay attention to this feature. Thanks for sharing the link.

[0]: https://support.mozilla.org/en-US/kb/quarantined-domains