Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Download one of the other browsers that allow you to set the user agent (and retain the setting). Set it as the default browser.I do wish there was a way to default it when clicking links in email thoug.
Type "about:debug" into the browser, without the quotation marks of course. Then go to settings and scroll to the very bottom. There you'll see UAString, it is the option you're looking for. I'm not a facebook user however, and have no idea if that will resolve your issues.