Better Seqta not working on Firefox

[MayonnaiseSoup]

I am running MacOS Big Sur. I am using Firefox.
My friend uses Better Seqta too, and has no problems with it.
I am not running in a private window, my laptop is a school computer and Better Seqta has all the permissions that it requested.
I am on Standard Security, running UBlock Origin.

Any idea why this problem is occurring?
I used to run the extension on Brave Browser, it had no problem.
(Better Seqta is enabled btw)