New
#31
FYI:
Try: Setting Firefox as the default browser does not work - What to do | Firefox Help
If that doesn't work backup your profile:
Download Hekasoft Backup & Restore 0.85
Uninstall Firefox:
Geek Uninstaller - the best FREE uninstaller
Allow scan for leftovers and remove them.
Manually check here for leftovers and delete if found:
C:\Program Files\Mozilla Firefox
C:\Program Files (x86)\Mozilla Firefox
Press the [Windows key+R] to open a Run dialog, type in %APPDATA%\Mozilla\ and click OK to open the Mozilla folder, then delete the Firefox folder if found.
Reboot.
Download a fresh copy of firefox and install it.
Restore your backed up profile using Hekasoft Backup & Restore.
Then try setting as default browser again and see if it works.