Ths SSL Observatory feature leaks DNS requests without the TBB
HTTPS-Everywhere is leaking DNS requests no matter whether I use Tor or not (but note that the TBB is not affected. See below for the reason). All tests were made in a clean new profile with FF 16.0.1 and HTTPS-E 3.0.2 installed.
The reason is that
is not enough to be sure to not leak DNS requests if you build your proxy settings manually and using applyFilter(). This is actually a Mozilla (Necko) bug documented here:
The only workaround I am currently aware of is setting "network.dns.disablePrefetch" to |true|, a thing which is done in the TBB. Then there are no requests leaking.