What is the full path name to Trash?

vornez said

Is this some type of anti privacy malware?

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Do you have any add-ons for cache?

My cache folder is: c:\Users\ti\AppData\Local\Mozilla\Firefox\Profiles\bm8tbqjt.default\cache2

The mysterious trash folder is: c:\Users\ti\AppData\Local\Mozilla\Firefox\Profiles\bm8tbqjt.default\trash

I have re-installed firefox 33.1 and the problem no longer occurs. Therefore it is unknown whether I had any add ons for cache, sorry.

Download Firefox Full Installer For All languages And Systems {web link}

Please upgrade to 35.0.1

That was very good work. Well Done. Please flag your last post as Solved Problem so other will know.

Yes I did have the following add ons:

avast! Online Security 9.0.2006.53 Avast Browser Security and Web Reputation Plugin from avast free anti virus 2014.9.0.2008

When installed it allows Firefox to delete its cache, after it copies the cache files to a directory that is the following or equivalent: c:\Users\ti\AppData\Local\Mozilla\Firefox\Profiles\bm8tbqjt.default\trash765

Avast is causing Firefox to leave a papertrail for unknown reasons.

If content is moved to the Trash folder then this indicates that there is a problem with the current cache. Make sure that you do not have security software that is interfering with the Firefox cache management.

Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/