Take my eyes but not my browser. Here be an article showing how to fix the issue where Firefox cannot be set as a default browser in Ubntu-based distributions (KDE neon specifically), covering manifestation of the problem, associated bugs, mimeapps.list file, update-alternatives command, some other tips and tricks, and more. Do come along. https://www.dedoimedo.com/computers/firefox-cannot-set-default-browser.html Cheers, Mrk
