Name the add-on and url where you got it. You can't find it because you never used add-ons, or you can't find it because you can't find the menu bar. You can't find how to use. '''Research your extensions''', You might also find addition information on the extension's add-on page, some may have updates, some solutions may be found in the developer comments or user comments on the add-on, or on the "'''View all versions'''" link which is part of the '''Release notes''' at the bottom of the add-on page where you may find a compatible version available that is waiting for approval. '''Bring up extensions''' # "Ctrl+Shift+A" (Add-ons Manager) # Select Puzzle piece on left-side for Extensions List You can make Firefox 4.0.1 and '''Firefox 5.0''' look like Firefox 3.6.17, see numbered items 1-10 in the following topic [http://dmcritchie.mvps.org/firefox/firefox-problems.htm#fx4interface Fix Firefox 4.0 toolbar user interface, problems (Make Firefox 5.0, or 4.0.1, look like 3.6)]. -- Picture of [http://dmcritchie.mvps.org/icons/fx4toolbars.png before/after] changes.