If you want to disable mobile sites in the native browser
Did some searching around and no one on this forum has posted how to do it.
-Open browser
-Type "about:debug" in the address bar - press "go" Nothing will happen, this will only enable more options in the menu
-go to menu -> more -> settings
-scroll down to "UAString"
-Select "desktop"
your good to go
**credit to toastedoats
Tried it, UAString is still not in the settings.