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On #2, Fn-up and Fn-down are respectively equivalent to page up and page down on the Mac (at an OS level).

Yes, in the "Update" section I addressed that. But still Home and End aren't available.

Edit: The comment below mentions another way to achieve Home/End features in FF.

Are they not? I use Cmd+Up and Cmd+Down to scroll to the top and bottom of a page, respectively, on Firefox.

Also fn-Left and fn-Right

You're right, I just used them and it works. Weird how Mozilla didn't mention it on the link I provided.

They do, but it might be confusing because they list "Home" and "End" first, before the Cmd+Up/Down alternatives.