08-15-2021, 10:53 AM
You can change general.useragent.override in about:config and pretend to be anything you want. If you remove the part "Android 9; Mobile;" from the general.useragent.override variable most, if not all sites will show the desktop variant. There are some add-ons that allow you to switch the user agent quickly or you can use second profile to have a 'desktop'-firefox and a 'mobile'-firefox.