671691 - setting window.crypto.x disappears after gc

Status: RESOLVED WORKSFORME

(Core :: DOM: Core & HTML, defect)

Description

[Felix Lee]

Attachment: a.html

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:7.0a2) Gecko/20110713 Firefox/7.0a2
Build ID: 20110713042002

Steps to reproduce:

If I set properties on the window.crypto object, my changes disappear at some arbitrary time, probably after a GC.

Load the attached "a.html" in a firefox browser.

Click "generate garbage" a few times.
Eventually the result will be "crypto.x = undefined".

Clicking "ref crypto" will keep a reference to window.crypto, and doing that will prevent the disappearing value.

I tested this in Aurora 7.0a2 (2011-07-13)

Comment 1

[Felix Lee]

Forgot to mention, this bug was found by Emily Stark.  I just isolated it into a small testcase.

Comment 2

[Boris Zbarsky [:bzbarsky]]

This is the case for most DOM objects.  DOM nodes are special-cased to preserve the wrapper when expandos are added....

I believe there are no plans to change this until new DOM bindings land.

Comment 3

[Florian Bender]

IIRC, the new bindings for window.crypto landed, and I can not reproduce with the attached testcase.