[Twisol]

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

[bhnmmhmd]

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

[Twisol]

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

[akvadrako]

Also fn-Left and fn-Right