You can access your FireFox cache files by typing this "about:cache?device=disk" into your FF URL bar
There is the cache directory will tell you the directory in which cache is stored, this is not IE and you'll not be able to browse by going to that directory, because its in encrypted form. If you want to browse your cache, you're in the page!
The about:cache?device=disk is the disk cache page! browse around in here.
This is completely different to what is temporary internet files in IE.
Use the quick find function by pressing / (forward slash) and type in keywords to go a particular element in cache, Use F3 to go to next search result .
Use Shift+F3 to go to previous result.