[tbb-dev] How to enable window.performance.timing on TBB

[Tom Ritter]

If you build Tor Browser yourself it would be pretty simple to put in
a test for an environment variable, and if that's present ignore the
RFP check. But that's probably not something we'd ship in the official
one...

-tom

On Wed, 6 Nov 2019 at 23:38, Zhao Zhang <zz156 at georgetown.edu> wrote:
>
> Cool, thanks!
>
> On Wed, Nov 6, 2019, 18:21 Matthew Finkel <sysrqb at torproject.org> wrote:
>>
>> On 2019-11-06 23:12, Zhao Zhang wrote:
>> > Hi there,
>>
>> Hi!
>>
>> >
>> > Sorry I have a silly question, currently I'm preparing some timing
>> > analysis on TorBrowser and find that it looks like most of
>> > window.performance info has been disabled (I think, for security
>> > reasons).
>> > It returns all 0s for executing script "window.performance.timing",
>> > and returns empty [] for executing window.performance.getEntries().
>> >
>> > I've looked through about:config, tried modifying
>> >
>> > devtools.dom.enabled;true
>> > dom.enable_performance;true
>> >
>> > but looks still no effect. So where is the proper way to enable
>> > performance timing? Thanks.
>>
>> Indeed. This API is disabled by the privacy.resistFingerprinting pref.
>> We began experimenting with a way of working around this, but we haven't
>> succeeded yet (mostly due to lack of time).
>>
>> https://trac.torproject.org/projects/tor/ticket/30932
>>
>> Sorry we don't have a more helpful answer right now.
>>
>> - Matt
>
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