On 29/10/12 15:46, intrigeri wrote:
> sajolida@??? wrote (29 Oct 2012 13:09:25 GMT) :
>> http://www.lalit.org/lab/javascript-css-font-detect/
>
>> This one uses the technique described above to check for a set of 23
>> common fonts.
>
>> Tails gets 9 fonts out of 33.
>> TBB gets 33 fonts out of 33, even though some of them are not installed
>> on the system.
>
>> My question is does this difference in behavior make sense?
>
> Not to my eyes.
>
>> Can it be related to any existing TBB patch?
>
> I'm not sure I get the question right, because both pieces of software
> under test are supposed to have the TorBrowser patches applied.
>
> I skimmed over the only obviously font-related patch, and as far as
> I understand it, it is not supposed to trigger such behaviour.
>
> I also had a quick look to see if an iceweasel patch was about fonts,
> and did not find any.
>
> My next bet would be to compare TBB's and Tails' Firefox configuration.
While doing that I found out that TBB had two font related preferences
that were not in Tails:
pref("browser.display.max_font_attempts", 10);
pref("browser.display.max_font_count", 5);
Those preferences activate the Torbrowser patch called
0011-Limit-the-number-of-fonts-per-document.patch. Adding them to
~/.mozilla/firefox/default/user.js removes the difference in results
from those two online fingerprint checks.
So, shall I add those to
config/chroot_local-includes/etc/iceweasel/profile/user.js, or maybe
there is a better place?
