How to set Firefox browser as default via command line in Windows?
To set Firefox browser as default via command line in Windows, it is necessary to use the helper.exe + commands. The Firefox installation will be (depends of your system): $mozilla_dir = "C:\Program Files\Mozilla Firefox\uninstall" or $mozilla_dir = "C:\Program Files (x86)\Mozilla Firefox\uninstall" Enter in the directory and type the option that you want: cd $mozilla_dir .\helper.exe /SetAsDefaultAppGlobal /SetAsDefaultAppGlobal: it will set Firefox as the Global Default Browser (must be executed as Administrator) /SetAsDefaultAppUser: it will set Firefox as the User Default Browser (must be executed in user context) Source: http://superuser.com/questions/787608/how-to-set-default-browser-in-windows-7-via-script