We can customize Firefox browser to a great extent like colored tabs, hiding tabs bar and much more. If you are tired of hitting back / forward button to see already browsed webpages, then try Tab History Menu. It is a Firefox plugin that allows you to see history of each tab in a single click.
After download and install, click on specific tab to see history of webpages viewed in that tab in a drop menu. You can click on any item shown in the history drop menu and goto to that previously browsed webpage. It adds extra funtionality to Firefox browser without adding any extra button or taking more space – cool. Download Tab History Menu