Out final experiment on 100% of our Nightly user population just finished.
We enabled the API for 110605 users. Out of that we only had 2 reported
crashes related to the Intersection Observer API. Both were causes by
Add-ons using the API in XUL documents. We  already addressed this issue in
https://bugzilla.mozilla.org/show_bug.cgi?id=1353529. I think its safe to
go ahead and finally enabling this feature by default.

On Fri, Mar 24, 2017 at 7:32 AM, Tobias Schneider <[email protected]>
wrote:

> We just successfully run another experiment, enabling the
> IntersectionObserver API for 50% of our Nightly user population. No related
> stability issues reported. Also, find a Gecko profile using an Intersection
> Observer per element (109192 total) on the single page version of the HTML5
> spec here: https://www.dropbox.com/s/cm55ixrvk7bqaxu/
> SinglePageHTML5SpecIntersectionObserver.sps.json.zip?dl=0.
>
> On Thu, Mar 16, 2017 at 1:52 AM, Patrick Brosset <[email protected]>
> wrote:
>
>> >
>> > 1)  Is there devtools support for this (e.g. to be able to see what
>> > intersection observers are registered where)?  If not, are there at
>> least
>> > bugs tracking it?
>>
>>
>> I filed https://bugzilla.mozilla.org/show_bug.cgi?id=1347849 for this.
>> MutationObserver would be a good one to add support for too!
>>
>> On Thu, Mar 16, 2017 at 8:39 AM, Anne van Kesteren <[email protected]>
>> wrote:
>>
>> > On Wed, Mar 15, 2017 at 7:38 PM, Boris Zbarsky <[email protected]>
>> wrote:
>> > > On 3/15/17 1:32 PM, Tobias Schneider wrote:
>> > >> 2.3) Platform tests are in the process of being upstreamed by Google
>> (
>> > >> https://github.com/w3c/web-platform-tests/pull/4384).
>> > >
>> > > That seems to be in limbo for well over a month now.  jgraham just
>> poked
>> > it
>> > > in hopes of at least getting automated testing going so we find out
>> > whether
>> > > Firefox passes the tests... but that will test release, afaik. Have
>> you
>> > > checked whether we pass these tests?
>> >
>> > They would be run against Nightly.
>> >
>> >
>> > --
>> > https://annevankesteren.nl/
>> > _______________________________________________
>> > dev-platform mailing list
>> > [email protected]
>> > https://lists.mozilla.org/listinfo/dev-platform
>> >
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>
>
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