First tab will not close and address bar in tab does not update.
The first tab and its address bar are not working as expected. I am unable to close the first tab using the close icon on the tab or by selecting close tab from right click menu. I also find that the address bar when displaying the first tab does not display the current web address, only text that has been previously written into the address bar field.
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While trying to figure out a solution, I removed my themes and I closed the tabs I could, then clicked on the new tab button, doing so changed my original tab into an (Untitled) tab and created a new (Untitled) tab. I then found I couldn't close either tab, I clicked on new tab again, got a third (Untitled) tab, which again I couldn't close. I then closed Firefox choosing not to save. This appears to have fixed the problem; however I do not know which of the above action(s) resolved it.
I'm having the same problem. I've filed this bug at Bugzilla. (ID 610787)