I'm slightly puzzled by the fact that since tonight ccleaner isn't purging my system of files generated by Mozilla/Firefox. I still have the options checked. It still cleans internet explorer and Google chrome (though I rarely use either).
I have the latest version of Firefox, and Ccleaner.
I am using Firefox 20.0.1, and CCleaner v4.14.4707 (64bit).
Firefox has indeed updated recently, I'm fairly sure that it happens automatically now. It was definitely not running while I ran CCleaner. I'm sorry, I don't know what the 'maintenance service' in Firefox is. I have a box selected which erases each browsing session on closing the browser, this would appear to be a default selection as I haven't opted for it. I have also noticed that Firefox does not collect a browsing history as I surf. Although this isn't really an issue I am a little disconcerted by it.
Ah ha....we may be getting somewhere. I've checked the privacy settings as you've suggested, and it would appear that neither option was selected, the two options being either "Firefox will Remember History" or "Firefox will Never Remember History". This is probably the source of the problem. But what should I set it to? I'd like to have a history available as I surf, but I have no particular desire to save it on closure of the browser. Would that requirement be met best by the first option?
With regard the version of Firefox, I am in fact using 29.0.1, my original post was incorrect.
In the run dialog, enter %LocalAppData%\Mozilla\Firefox\Profiles and hit enter
A folder should open with a subfolder with a name along the lines of rfgd933w2.default (the string before .default is random)
open it and you should see a cache folder, please confirm that there are files inside your cache folder by right clicking on it and selecting properties.
If you close firefox, and open Task Manager's process tab (called Details in Windows 8+), can you confirm there are no firefox.exe or plugin-container.exe processes running?
If you try to run the cleaner with Firefox open, does CCleaner prompt you to close it?
I can confirm that there are no such processes running in Task manager, and when I run CCleaner with Firefox still running it does indeed prompt me to close it before it can finish its sweep.
Try closing firefox, navigating back to the folder with the cache folders in it again, and manually deleting the cache folder (just "cache" and if it's there, "cache2", not the others)
Then reopen firefox, visit a page, close, and see if CCleaner can clean the cache
Would that be jumpListCache, OfflineCache or startupCache? Those are the three present along with a folder called safebrowsing and a file called _CACHE_CLEAN.
As you will have gathered by now, I'm far from informed as to the complexities of the setitings we've been discussing. I've taken a screen shot of the advanced tab in my Firefox options to illustrate the current situation, and attached it to this post.