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Re:YouTube change served lower-quality video to Firefox 43 f... by Survey_Sez on Sunday January 10, 2016 @08:29PM (#10878240)
There is in fact already an extension which will randomly change the browser user agent.

https://github.com/dillbyrne/random-agent-spoofer

Re:YouTube change served lower-quality video to Firefox 43 f... by danieldk on Monday January 11, 2016 @02:25AM (#10879352)
Also, uMatrix can randomly switch user agent strings (among many other things).