How to remove latest Firefox update?

Before the last update Firefox was wonderful! toolbars were working fine and then it prompted to install updates today and suddenly now, the toolbars are not compatible. Now we are not able to click a link without it being prevented and having to click allow. Neopets and Facebook games are not working either.It is also showing problem with websites. Facebook is having problem, we get these strange boxes where content is with 4 numbers in each corner. There are many users on all browsers that use Facebook daily Mozilla's latest release has disappointed many users.