xChris: glad to know that you found a way to make the problem go away, but this isn't a proper fix and I'd like to get to the bottom of the issue. If you reinstall firefox, does the problem re-appear? If so, can you share the output of the following command, run in a terminal:
xdg-settings get default-web-browser -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1509139 Title: Shows "Chromium isn't your default browser" since 15.10. To manage notifications about this bug go to: https://bugs.launchpad.net/xdg-utils/+bug/1509139/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs