Here's what it looks like: http://i.imgur.com/QSefdOQ.png
Also when I open a new window some of the buttons from addons are huge and they don't shrink until I click the download manager button: http://i.imgur.com/AmbB8Y4.png
When the window saying that Firefox 20 had been released came up earlier today, I clicked "Install Later." Later on I was working on something and Firefox suddenly froze. I force-quit it and restarted it and it automatically upgraded to 20, but everything got screwed up like this. Could someone please tell me how to fix it? Thanks.
EDIT: I found that disabling the "Tab Mix Plus" extension fixed these problems.
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Well done for solving the problem, and posting back. It may help others. I am unable to mark an original post as the solution so I have marked this as the solution instead, so that the thread is seen as solved..