Try with Addons like ads block or popup block

• http://addons.mozilla.org/

Thanks, but I am already running ad block plus. And I do not want to disable pop-ups per se, just the back to top button.

hello, is this appearing on every site? can you try to replicate this behaviour when you launch firefox in safe mode once? if not, probably an addon is causing this...

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

Hi Philipp, thanks for your reply. It made me realize that I have just made a complete fool of myself, as this in fact seems to be site-specific. Yes, it was still there in safe-mode as well as on another computer that has no add-ons installed. It only pops up on "long" websites i.e. those that let you scroll down a fair bit. Not too many pages contain that much info, but ebay sites do, pinterest does and some others as well. Which is why I thought it was a firefox feature that only came up on long websites. But I just looked at facebook (which is a long site I do not frequent) and it was not there. That pretty much answers it. Sorry to have wasted everyone's time :-( But I am grateful that you asked the right question :-)

ok, glad that the issue could be cleared up this way...

you could use adblock plus to hide those elements on ebay though. therefore you'd have to go into the adblock filter settings & add the following filters to your custom element hiding rules:

ebay.com#a(id=gh-bt)
ebay.com#b(class=bk2top)

Oh man, you made my day :-) Thank you ! (Took me a while to work out those adblock functions - not computer-savvy by any stretch of the imagination, but got it done). Hurray :-)