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DEL /F /S /Q %TEMP%
/F Force deleting of read-only files.
/S Delete specified files from all subdirectories.
/Q Quiet mode, do not ask if ok to delete on global wildcard
After that I'd recommend a reboot and then try to download and reinstall Firefox. On a side note if you do not feel comfortable with running the above command you should be able to google cleaning software which basically will do the same thing. Hope this helps.