Since I installed ubuntu 22.04 I have the following error message after clicking on a link in thunderbird if firefox is already running (instead of opening the link in a new tab):
Firefox is already running, but is not responding. To use Firefox, you must first close the existing Firefox process, restart your device, or use a different profile.If firefox isn't running, clicking on the link opens a new firefox instance and displays the corresponding web page.
The helper app for opening links in thunderbird points to /snap/bin/firefox.
The same problem occurs if I try to open a website (in a new tab) from command line for example firefox www.google.com.
I guess it has something to do with the fact that firefox is installed as snap now, but I am not sure.
What can I do, to solve the problem?