Multiple prefs.js files

I have a re-occurring problem in some of my firefox profile folders. The profile folder creates 999 empty prefs.js files. They are all numbered a different number all the way up to 999(i.e., pref-999.js).
I don't know if it is slowing down the browser. They Are All 0 bytes.

This happens when there is a problem with the unnumbered prefs.js file.
Firefox always creates a numbered temp file and when that has finished properly then this file is renamed to prefs.js to replace the current version of this file.
It is likely that some security software is blocking this file against changes if the numbered file stays.
You will have to delete all pref-##.js and prefs.js files to see if that prevents numbered file from showing up.
*http://kb.mozillazine.org/Multiple_profile_files_created

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