Description of problem:
The contextual menu for mozilla products like thunderbirs and firefox get hidden by the top black bar of gnome shell.
Version-Release number of selected component (if applicable):
a) Linux localhost.localdomain 3.9.2-200.fc18.x86_64 #1 SMP Mon May 13 13:59:47 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
With thunderbird always
With firefox not all the times
Steps to Reproduce:
2. hit new message
3. write a word wrong that has several options for spelling
4. right click on the word that has red underline saying that is mispelled
The top option, usually the most useful is hidden behind the top bar of gnome shell, if you get the mouse over, you can see a very thing blue line and you can actually select that word.
The top option to be below the top black bar of gnome shell.
You can see pictures of the problem in my blog, so you can have a clear idea of the problem. My blog is in Spanish, but you can look at the images anyway.
This has been fixed in GNOME 3.8 / Fedora 19.
For details see https://bugzilla.gnome.org/show_bug.cgi?id=633620#c135