User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.4; en-US; rv:1.9b3) Gecko/2008020511 Firefox/3.0b3 Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.4; en-US; rv:1.9b3) Gecko/2008020511 Firefox/3.0b3 If you hold down the Back button, a drop-down menu will appear showing you where you've been in the current tab. The idea is that you don't have to click the Back button to go back to a page you saw 3 pages ago-- you can just select it from the menu and Firefox'll jump back to it. Unfortunately, the menu doesn't work-- selecting an item from the menu will always take the browser one page backwards, no matter how far back the menu item you selected is. Reproducible: Always Steps to Reproduce: 1. Open a new tab or new window. 2. Visit a few sites. 3. Use the Back button's drop-down menu to go back 3 pages (or 2, or 4, or whatever). Actual Results: The browser goes back one page, no matter how far back the item I selected in the menu is. Expected Results: The browser should have gone back to the page I selected in the menu. This is in Firefox 3.0b3.

Verified dupe, this will be fixed in beta 4.