Certain Firefox users may come across a message in the extensions panel indicating that their add-ons are not allowed on the site currently open. As of Firefox version 115, we have introduced a new back-end feature to only allow some extensions monitored by Mozilla to run on specific websites for various reasons, including security concerns.
https://lapcatsoftware.com/articles/2023/7/1.html
https://support.mozilla.org/en-US/kb/quarantined-domains
Disabling:
extensions.quarantinedDomains.enabled=false