Those are not standard toolbar buttons for Firefox, you probably had an extension installed that added those toolbar buttons. I do not know of an extension that has such a feature. Can you still access the old computer to check what extensions were installed?

Unfortunately I don't have access to the old computer. I have the add on "Multiple Tool Handler" and this does all the actions eg close left, right, all, undo etc but only works from a drop down menu. The icons were very useful but can't find anything in add ons that might do it.

Maybe:

• RemoveTabs: https://addons.mozilla.org/firefox/addon/4227/

Excellent - you are a star

Thanks