Comment 14 for bug 1244884

I've applied the fix in this page and now it works:

https://askubuntu.com/questions/540939/xdg-open-only-opens-a-new-tab-in-a-new-chromium-window-despite-passing-it-a-url

Summary: there is some problem with the file ~/.local/share/applications/chromium-browser.desktop that breaks the exec command. Maybe one of my installed packages modified it incorrectly (the new pepper flash plugin? I have it installed too)