Run the following command as normal user and as administrator.
firefox.exe -silent -setDefaultBrowser uninstall\helper.exe /SetAsDefaultAppGlobal uninstall\helper.exe /SetAsDefaultAppUser
Just another Boolog site
Run the following command as normal user and as administrator.
firefox.exe -silent -setDefaultBrowser uninstall\helper.exe /SetAsDefaultAppGlobal uninstall\helper.exe /SetAsDefaultAppUser