@modulux Hello. I might be able to help with that, but not sure what Semaphore is - can you share a link to it?
@plwt Sure, it's a fedi client: https://semaphore.social/
It's not instantaneous, it seems to take a while from opening it to cpu use bursting.
@modulux It looks like development stopped on that project some months back.
I do not know the answer right now, but you may wish to file a support request at https://support.mozilla.org/en-US/questions/new/firefox