sudo apt update
      sudo apt purge firefox // sudo apt --purge autoremove firefox
      sudo rm -rf .mozilla
      reboot
      sudo apt update
      sudo apt install firefox

      (Since I removed the profile folder, the standard tab and bookmarks open/show after starting firefox now, as expeced. I'm also not longer logged in.)

Hi everyone, Thanks a lot for taking time reading this! :) I have the following problem with my firefox on Kubuntu 20.04 on my laptop: since a couple of weeks, firefox opens normaly after rebooting, remembered all tabs and my firefox account etc., but it's just not loading anything. I can still type in a web adress or something in the search, I can also still select the drop-down menu on the right ("Open menu") and select e.g. "Settings", but nothing happens afterwords. Same problem for all websites. Some of the main buttons are also not functional (refresh, back/forward). I attached a screenshot from the "empty" firefox (but not sure if that's of any help anyways ;) ). I tested a couple of things so far, nothing helped: 1) Internet is working, I tested ping, apt is working as well as a differnt browser I installed now). 2) I reinstalled firefox completely by running the following commands: sudo apt update sudo apt purge firefox // sudo apt --purge autoremove firefox sudo rm -rf .mozilla reboot sudo apt update sudo apt install firefox (Since I removed the profile folder, the standard tab and bookmarks open/show after starting firefox now, as expeced. I'm also not longer logged in.) 3) By starting firefox via the console, no error messages were shown 4) I created a second ubuntu unser profile, to test if firefox would work there: it doesn't 5) Since I have a dualboot with Win10/Kubuntu 20.04, I started Windows and tested firefox there: it is working as usual. 6) I also obviously tried to google this problem, but either I put the wrong keywords in or this problem is pretty unique/new? If you need any further information on my system, I'm happy to provide them! Thanks a lot for any recommendations and further ideas, what to do! I'm pretty much desperate for a solution by now, as during home office a not well working system is a pain! ;) Thanks and stay safe, Katrin