I suspect bug 1147765 to be the culprit, but I have no concrete proof.
Sami, would you be able to take a look here, since you've done a lot of work on Style Editor recently? I am able to reproduce this too, using mozilla.org as an example site.
status-firefox38: --- → unaffected
status-firefox39: --- → affected
status-firefox40: --- → affected
This is indeed caused by my recent work and seem to be fixed once the second patch in bug 1148770 gets reviewed and landed.
This appears to be fixed now by bug 1148770. But bug 1148770 comment 89 suggests it make change or be undone. Sami, is it safe to close this one now?
It didn't fix the leak but it fixed this bug. It was also uplifted to Aurora as test-only change so this should be fine on Dev Edition too.
Status: NEW → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → FIXED
status-firefox39: affected → fixed
status-firefox40: affected → fixed
Whiteboard: [devedition-40] → [polish-backlog]
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