I can't clear or move my cache [with FF 15 and FF16)

Question

I can't move or clear my cache! When I go to options>advance>network, there is just blank space under "Cached Web Content". But when I go to about:cache:
Memory cache device
Number of entries: 731
Maximum storage size: 32768 KiB
Storage in use: 15459 KiB
Inactive storage: 15558 KiB
List Cache Entries
And I note that it doesn't list a location [whereas for the offine it does:
Number of entries: 0
Maximum storage size: 512000 KiB
Storage in use: 0 KiB
Cache Directory: C:\Users\Bernie\AppData\Local\Mozilla\Firefox\Profiles\1rp651v2.default\OfflineCache
I've tried to move the cache directory and I set the browser.cache.disk.parent_directory in my about:config, but nothing has ever gotten written to that directory [it is already created].. And in fact, I can't find my cache: it says that
there's 15megs somewhere, but I can't find where: I've poked in the profiles\...default hierarchy and there's basically zero spaced used except for 66 megs in "urlclassifier3.sqlite".
I noticed this with FF15 and I'd hoped that it would be fixed when I upgraded to FF16, but it is all still the same.

Answer 1

I have the same problem, updated to FF 17 today and the problem persists.
I dont have any settings that modifies the cache's behaviour, everything is as it should be but after i installed an extension a week ago FF wouldnt start at all !, so i reseted FF, extension was gone, replaced my old profile from FF (since the reset deleted all my settings) and everything was back EXCEPT this cache BUG, because of this cache bug my NEW TAB (top pages u visited) is also bugged as i cant remove any site that i dont want in my top 5...