Use a bit more generic user-agent

[mozillian]

Hey there, i believe giving the option to change to a bit more generic user-agent instead of the direct Firefox one in the block fingerprinting page would be nice, Firefox is capable of doing everything pretty much all browsers can and i believe there's no reason to allow websites to directly see what operating system & version of the browser you're using. I'm also confident that most people think this way.

[Jon]

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