810344 - Memory leak when disabling bootstrapped extension

Status: NEW

(Core :: General, defect)

Description

[Matthew Gertner]

Attachment: Test extension

To reproduce:
1. Install the attached extension.
2. Restart Firefox.
3. Disable the extension.
4. Load about:memory?verbose
5. Search for "salsita".

Result: The test.xul compartment is still in memory.

Note that this problem doesn't seem to occur unless the extension is installed and enabled when Firefox is started. If you install it or enable it while Firefox is running, then the compartment is freed as expected.

Comment 1

[Matthew Gertner]

I did some more analysis and it looks to me like this is definitely related to the <browser type="content" /> in the XUL page opened by the extension. If I remove that or even just remove the type attribute then the leak doesn't occur.

Comment 2

[Matthew Gertner]

Seems like the same problem occurs if the XUL file references a JS file, even if the JS file is empty (see second test extension attachment).

Comment 3

[Matthew Gertner]

Attachment: Test extension 2

Comment 4

[Blair McBride [:Unfocused] (UNAVAILABLE)]

Based on above comments, not an Add-ons Manager bug.

Comment 5

[Jorge Villalobos [:jorgev] (he/him)]

Have you tested in a clean profile? How about the same extension, but not bootstrapped?

Comment 6

[Kris Maglione [:kmag]]

This sounds a log like bug 759919.

Comment 7

[Matthew Gertner]

(In reply to Kris Maglione [:kmag] from comment #6)
> This sounds a log like bug 759919.

Yes it looks like the problem does not occur when nglayout.debug.disable_xul_cache is set to true.