Super Antispyware had two versions of a file linked to Firefox, I believe. GMPOPENH264.DLL, one is \1.4, dated 5/13/15, and the other is \1.1, dated 10/21/14. Both are in Profiles\nnhbuugx\default, which was the subject of an earlier question. I had 506 PUP's identified by Malwarebytes that were linked to Firefox. These two Application Data Folders were selected as 'unknown' by the Anti-spyware program on 6/8/15. Can the two files properly co-exist, or should the older version be removed? The computer slowness I have experienced could be (maybe) from about the time of the last Firefox upgrade.