Description of problem: When I have a large number of tabs open, the left-most and right-most tabs are unaccessible. Using the shift button to go right, I get to the second last tab and shifting to the left, I see the 2nd tab. I cannot close these tabs from the drop-down list. I would guess a short-cut key sequence will work, but still it is an error that the tabs don't show up. If I delete a tab close to the right, the right-most tab will show up. Similarly with the left-most tab. Occasionally, I see a small bit of the tab (e.g. I can see 1/5 of the left-most tab peeking out behind the less-than symbol, but if I click the left arrow, the UI adjusts itself and I lose sight of that left-most tab. Version-Release number of selected component (if applicable): firefox-20.0-1.fc17.x86_64 How reproducible: Open 30 or so tabs for your firefox session. Click on a tab opened from an e-mail. It will show up in the browser, but you can't locate the tab on the top that is linked to the page. Delete the 2nd last tab created and it will appear then.
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Do you still see this issue in Firefox 22? And if so can you try it in safe mode? (https://fedoraproject.org/wiki/Firefox).
I recently upgraded my system to F18 and FireFox 22. The problem does not exist in that version. I will close as fixed in current release.