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the old firefox process must be closed

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I have a new Windows 11 installation (Fresh) and all my browsers are working ok except for FF. Whenever I click a link, the first window opens properly but when clicking a second link FF always gives me the error "firefox is already running but not responding. the old firefox process must be closed."

Ofcourse I searched the net and tried all the suggestions on this support page and what I googled. I installed FF Dev Edition, which shows the same issue. I created other profiles, same issue. In the end I tried (several times) to uninstall FF thoroughly (uninstalled, manually removed all installer files, appdata files, and even cleaned the registry) but all to no avail.

I am using Edge now, but I don't want to. Please help!

Attached screenshots