Firefox hangs when a file is uploaded using the file selection mechanism.

A "not responding" condition occurs after about the third selection in the file selection mechanism when I upload or download a file.
This problem also occurs with Thunderbird when I try to save an attachment and I want to specify a location. I have not noticed this problem on any other application. Window Explorer functions correctly.
By File selection meachism, I mean the window that appears with the HTML statement <INPUT type="file">.
This happenen every time when I use this mechanism although not always at the third level, sometimes at the second level, sometimes deeper.

It is possible that there is a problem with the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.
Delete the sessionstore.js [2] file and possible sessionstore-##.js [3] files with a number and sessionstore.bak in the Firefox Profile Folder.
* Help > Troubleshooting Information > Profile Directory: Open Containing Folder
* http://kb.mozillazine.org/Profile_folder_-_Firefox
Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost, so you will have to create them again (make a note or bookmark them).
See also:
* [1] http://kb.mozillazine.org/Session_Restore
* [2] http://kb.mozillazine.org/sessionstore.js
* [3] http://kb.mozillazine.org/Multiple_profile_files_created

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