Hello! I recently updated Qupzilla on my F27 system and after that my desktop started opening links in Firefox even though I had Qupzilla set at the default. It took me a while to realize what happened, but it looks like the filename for the .desktop file changed: qupzilla-2.1.2-4.fc27 provided /usr/share/applications/qupzilla.desktop qupzilla-2.2.1-1.fc27 provides /usr/share/applications/org.qupzilla.QupZilla.desktop I was able to use the following to workaround it: $ xdg-settings set default-url-scheme-handler http org.qupzilla.QupZilla.desktop $ xdg-settings set default-url-scheme-handler https org.qupzilla.QupZilla.desktop $ xdg-settings set default-web-browser org.qupzilla.QupZilla.desktop Since it is a backwards incompatible change, I recommend reverting it in F27 and perhaps leaving it the way it is in Rawhide if you want to rename it.
Or... provide a backward compatible (but hidden) .desktop file
Upstream renamed the .desktop file, send any complaints there.
What's sure is that the name will change again with 2.3 which will rename the application to Falkon.
It would be reasonable to provide a .desktop file that is backwards compatible in the spec file for stable Fedora releases, even if upstream changed it. This way we can provide a stable experience for Fedora users.