I recently updated Firefox on Debian to 128.13.0 and I saw this error message in the add-on tab:

User-Agent Switcher and Manager is incompatible with Firefox 128.13.0

No more information is shown about this issue.

I think it's very weird that Firefox would introduce a breaking change that makes add-ons stop working in a minor version update. But maybe they disregard semantic versioning.

Is there something I can do to fix this? Or should I wait for an update of this add-on?