Hello Abhishek_Barua i was having a similar issue after an update a few days ago i thought i was the only one experiencing the problem but if it’s universal it’s going to get fixed
There was an update release about 12 hrs ago am not sure if it solves the issue but if it does fix the bug I’ll update the thread
For now I’m going on the extensions section on Firefox and turning off and on all the extensions. By doing that everything seems to work at least for one session.
I am suffer by this bug too. I did not change the theme or customize. I just install some addons.
The ones I installed they are there, but the preinstalled ones dissapear and are not active.
If I delete them manually and reinstall the addons they works then as expected.
Thank you for your information. I’m sure there are users didn’t change themes as same as you. Unfortunately our test only showed the result as i commented. We haven’t found anything new on VM.
We tested on rolling-testing distro which is having Firefox 81. Older version could have more bugs.