User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b6) Gecko/20100101 Firefox/4.0b6 Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b6) Gecko/20100101 Firefox/4.0b6 If I try creating multiple tabs be pressing Ctrl + T keyboard binding, Firefox creates invisible tabs that are not accessible. Reproducible: Always Steps to Reproduce: 1. Open firefox 2. Try pressing Ctrl + T followed by Ctrl + W continuously 3. Now press the Group All Tabs button 4. You will see some empty tabs with loading symbols 5. Also navigation from then on, using Ctril + Tab or Ctrl + Shift + Tab does not work properly This bug is reproducible in both windows7 as well as windowsxp. Infact, in windows 7 the hidden tabs are visible in the aero peak feature Actual Results: Hidden tabs were created that were not at all accessible Expected Results: All the tabs should be visible

The new tabs are only 1px wide. You can see that in the screenshot. It's a dupe of bug 585785.