Pep up the Firefox History
The original Firefox history lists the recently visited websites in a sidebar displaying only the titles of the websites that the user has visited. The change is high to visit the wrong page if a website uses the same or a similar title for all of it pages. There is also no indication of when that website was visited.
Thumbstrips to the rescue. This Firefox add-on peps up the Firefox history function. It adds a toolbar at the bottom of Firefox above the status bar that displays thumbnails of the pages that have been visited recently. The page title and the time of the last visit are displayed as well.
A click on a thumbnail loads that website again immediately. It is possible to change the order of the thumbnails and stop the recording of thumbnails. If you like you can keep thumbnails of ten websites in that bar and use it as a quick load function. Moving the mouse to the right or left end of the screen will scroll the thumbnails automatically in that direction.
The hotkey F2 displays and hides the toolbar which continues to record pages if the recording is still active. Thumbstrips can be saved as well and everyone with the extension may load them. This could be very interesting for a research project for instance.
Update: The Firefox add-on has not been updated since 2010 which is a strong indicator that it has been put on ice by the developer. It needs to be noted that the extension is only compatible with Firefox 3.6.x or older, and not newer versions of Firefox. There does not seem to be a comparable extension available for newer versions of the browser.
The next best thing is probably Mozilla's own Panorama feature which you can use to group tabs in Firefox.Advertisement