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See discussion in bug 893012 comment 22 and nearby. Filing this in a separate bug because the defect identified in bug 893012 may involve many small fixes all around gecko and gaia.
Created attachment 775992 [details] Pointer to Github pull request: https://github.com/mozilla-b2g/gaia/pull/10991 Pointer to Github pull-request
This PR also includes bug 894135, another leak-fix. I confirmed that we do in fact need both changes.
Comment on attachment 775992 [details] Pointer to Github pull request: https://github.com/mozilla-b2g/gaia/pull/10991 r+, thanks
There's a regression in fix of 894135. Warm boot timing measurement is failing. Root cause: When event type is 'appopen' to be watched, the event target is frame instead of iframe. I am going to fix this in another bug.
Uplifted d85dbb240e000903c9cb0a7a1f8aff45b3592e28 to: v1-train: 3724c21c68f88169a443e2a5636b65b4a4a58f59
I think we have to uplift https://bugzilla.mozilla.org/show_bug.cgi?id=894230 as well.