system
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It does not appear to be a firefox issue. I have this problem and I have seen this problem documented and in every instance the solution was to uninstall Avast.
Here is one instance:
https://support.mozilla.org/en-US/questions/993338
And here is another instance:
http://www.geekstogo.com/forum/topic/338727-firefox-file-dialog-save-open-export-etc-does-not-appear/
And in the latter instance, the person said that Avast gave him a workaround.
“In the meantime, Avast has provided me with a workaround from their end of things. Namely, renaming the snxhk.dll file (“c:\Program Files\AVAST Software\Avast\snxhk.dll”) so that it doesn’t try to activate, and then restarting Firefox. Obviously, there is some kind of interaction between Avast’s sandbox (which, I didn’t even install/activate) and the Outpost Firewall. Avast has indicated that they are going to incorporate a more permanent fix for this into their next version - but, I’m not sure exactly when that will be.”
Now, can some actual help be offered for this problem?