[tor-talk] problem with cache preferences in TBB

[hepta tor]

Hi
the IP anonymity test at http://ip-check.info/ suggests that
browser.cache.memory.enable should be set to 'false'. in TBB from
about:config I set it to false but on every restart it is set again to
'true' (however this is not the case for browser.cache.disk.enable
which is also suggested by the test to be set to 'false'). Does
anybody know what settings to change such that the value is not reset
to 'true' on every restart of TBB? Also, is there any specific reason
why the above mentioned preferences are not set to 'false' by default
in TBB?
thanks
HT