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Re:YouTube change served lower-quality video to Firefox 43 f... by toomuchtodo on Sunday January 10, 2016 @07:33PM (#10877998)
Could this be done with an extension?
Re:YouTube change served lower-quality video to Firefox 43 f... by gizmo686 on Sunday January 10, 2016 @07:40PM (#10878037)
Yes. https://github.com/muzuiget/user_agent_overrider

As far as I am aware, no extension currently offers the option of a random user agent, but many (including the one linked) allows user supplied use agents, and there is no reason you could not make one support random user agents.

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).
Re:YouTube change served lower-quality video to Firefox 43 f... by chei0aiV on Sunday January 10, 2016 @07:38PM (#10878031)
With an extension to this extension, yes:

http://chrispederick.com/work/user-agent-switcher/