Rated 5 out of 5 stars
1- Erases 4 types of cache (Memory, Disk, Offline, Favicon) indeed. What is not clearly mentioned is that you have the option to choose among these four caches: I almost missed this add-on because of that ;
2- Disk cache is truly well cleaned, I mean this add-on uses the right code. I say this because if you set a lower limit to disk cache (i.e. 50MB), once disk cache hits this limit Firefox sometimes slightly exceeds this limit (like say 51MB) : other disk cache cleaners I've tried failed in theses circumstances when this add-on does not (same operation obviously as Firefox built-in disk cache cleanup).
3- Consequently, 5 stars. Pop-up the volume -- I mean keep up the good work -- :)
>>> Merry Xmas to all <<<