I use Firefox exclusively as my browser. I also use a little app called CCleaner each time I go offline to clean out the cache, temp files etc.
What I've noticed, regularly, is that each time I run CCleaner, it always shows thousands of files from IE (plus the Firefox files). It looks like even though I use Mozilla, someone else is using IE when I'm online.
What could be causing this? It does concern me but I don't know whether to be annoyed or really concrned.
Use Winwows 8.1 and Firefox 36.04