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@cliff_cunningha , you have a lot of questions in your prompt 
, and since I think they're more likely to prompt a discussion than a single comprehensive and uniquely correct response, I've flipped the format accordingly.
I've been using Firefox almost exclusively with Canvas for over five years. I don't have an issue with the Crocodoc limitation, because it is easily worked around (by clicking somewhere on the page before proceeding to the next student in the SpeedGrader). Firefox's limitations with Crocodoc are detailed in How do I use Crocodoc in Canvas assignments?
Having said that, every browser presents a problem of some sort. I think most of the users in this forum will tell you that Edge and Internet Explorer cause more problems not only for teachers but especially for students than all of the other supported browsers put together. Nevertheless, those browsers are considered supported, and that's not likely to change.
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