Steps to reproduce: - Open Firefox on Android tablet. - Open some link on youtube, for example https://www.youtube.com/watch?v=d1Od6jdlgso - By default, link becomes mobile link, something like https://m.youtube.com/watch?v=d1Od6jdlgso - Click dots menu. - Switch `Desktop site`. - Link becomes normal desktop youtube link https://www.youtube.com/watch?v=d1Od6jdlgso - Switch to other application, Firefox should be opened in background. - Wait for some time. - Switch back to Firefox, which is in apps in memory list. Expected result: Switch `Desktop site` is switched on, and youtube link is desktop link https://www.youtube.com/watch?v=d1Od6jdlgso Actual result: Switch `Desktop site` is switched on, but youtube link is mobile link, like https://m.youtube.com/watch?v=d1Od6jdlgso , and switch `Desktop site` doesn't work until you remove Firefox from memory and reopen it.