I recently noticed that the "Open Link in New Tab" is not remembering the very first page in the tab history. The replication is simple. # Go to any page (Google works well) # Right click and chose to open a link on the page in a new tab # On the new tab, left click a link to load a new page # The "Go back one page" button will remain grey and you will not be able to go back to the first page for the tab. # Left click another link and the "Go back one page" button will now be active allowing you to go to the previous page, but not all the way back to the first page of the tab. This happens whether I use the middle mouse or a right click and chose open in new tab. It is present since I upgraded to Firefox 4.0, but was also happening before the upgrade when I was using Firefox 3.6.