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

[Zhao Zhang]

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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