I installed Ubuntu16.04, and set firefox as default browser, whenever I open links from external apps these are open as blank tabs in new browser window (no actual redirection to site, just a blank tab).
I've had the same problem for years and was finally able to solve it thanks to this strange new fashion of creating YouTube videos instead of writing a blog post (here is the original video).
Basically, you need to add a missing
%u parameter in
~/.local/share/applications/firefox.desktop at the end of each
$ grep -B 2 ^Exec= ~/.local/share/applications/firefox.desktop Keywords=Internet;WWW;Browser;Web;Explorer Keywords[fr]=... Exec=firefox %u -- Name=Open a New Window Name[fr]=... Exec=firefox -new-window %u -- Name=Open a New Private Window Name[fr]=... Exec=firefox -private-window %u