Originally Posted by Jarkko
Maybe related, seems that Waterfox is also unable to set itself as default browser.
It keeps asking to set itself as default at every startup, unless relevat option is unticked. Keeps doing the same even if defaults are all set (6/6) from Windows Control Panel.
Originally Posted by dcurrey
Had the same problem after reinstall waterfox 15. Could no longer set itself as default browser.
Original problem was uninstall of waterfox cased my gadgets to screw up. Only fix was restore point before waterfox 15 install.
Seems to me to be a conflicting issue between firefox(15.01) and waterfox(15.0). Testing this, I installed firefox, set it as the default browser, and then uninstalled it. Waterfox could not reclaim the "default browser" status properly after having set firefox as the default browser, even though it was removed from my computer.
I fixed this issue easily by reinstalling firefox, running it and setting it as the default browser. Closed firefox and ran waterfox again to set it as the default browser. It then kept the default browser setting properly.
Defaults can be set manually via...
Tools> Options> Advanced Tab> System Defaults