A button to scroll to top/bottom needs access to data for all websites?
Apart from that it hanged up firefox right after installation.

On my PC, I have fully functional default scrollbar, and this add-on is not needed.

It's the Android, where Fx has no scrollbar, where this add-on is the ultimate urge!

Guess what? On Fx mobile, this addon doesn't bother to work.

=USELESS

Does not work on v.60

I click on it and go straight to the bottom of page. fast

Don't work with Firefox 57 on Android

Not on android