Option to erase cache in firefox 3.5

I want the option to clear the cache back! This was present in earlier
versions and still in firefox 3.0...

In firefox 3.5, you can only clear recent history or do private
browsing, which also does not memorize history.  But I do not want to
clear history, I want to reduce needed disk space and thus erase the
cache and nothing but the cache. (I am working on a Linux system with a
quota and am permanently near the upper limit. Clearing the cache
usually gets me below the quota.) This was easy in previous firefox
versions (two clicks) but seems to require you to do the cache clearing
manually by navigating to the appropriate directory now, which is a pain
in the neck.

Is there an option to get the previous behavior back?
-- 
Klaus Kassner
------------------------------------------------------------------------