joluveba EDIT: I have deleted the ~/.mozilla/ folder, as Harvey suggested, and reinstalled Firefox, let's see if that helps.
This didn't work, it keeps hanging. 🙁
Tangetially, I have been trying the Firefox Appimage (103.0.1) as a possible substitute, but after a few promising hours of use, it eventually froze. To those who are interested in the Appimage, let me tell you I found a few problems: I couldn't import bookmarks (neither in html nor json format), I couldn't download files with the Always ask you where to save files on. On the positive side, it was very easy to integrate the appimage in the KDE menu, icon included. Easier than I expected.
Perhaps I will try the Firefox flatpak, but I don't expect it to work better than the .eopkg version.
Today's updates include newer versions of Nvidia drivers. I suspect this is a problem between Firefox and my old Nvidia GPU (my laptop uses AMD GPU and there Firefox never hanged), so let's see if it helps.