Closed Bug 611539 Opened 14 years ago Closed 14 years ago

[OOPP]Black rectangle appears behind Flash Object on


(Core Graveyard :: Plug-ins, defect)

Windows 7
Not set


(Not tracked)



(Reporter: alice0775, Unassigned)




(Keywords: regression)


(4 files)

Attached file reduced html
Build Identifier: 
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b8pre) Gecko/20101111 Firefox/4.0b8pre ID:20101111042449

Black rectangle appears behind Flash Object on

*This does not happens if I set dom.ipc.plugins.enabled to false.
*This does not happens on Firefox 3.6.x.

This may be related to Bug 607578 which was fixed by bug 596451 accidentally.

Reproducible: Always

Steps to Reproduce:
1. Start Minefield with new profile
2. Open URL ( )

Actual Results:
 Black rectangle appears behind Flash Object

Expected Results:
 Black rectangle should NOT appear.
Attached image screenshot
Blocks: 611698
Believe I'm seeing the same issue.

Was on this page:

Went to reply, & saw (in SeaMonkey ) & (in FF).

I came up with a regression range between 20101110 & 20101111:

As you mention, setting dom.ipc.plugins.enabled to false does look to bypass the issue, as does running in -safe-mode.

> Callek	therube: fwiw: (and the rest of its push) looks quite likely

My discussion of this should be able to be found (tomorrow) at: .  Should be the 2010-11-16 log (I suppose).
plugincontainer needs work yet - as seen in SeaMonkey Trunk.

In this case, the plugin is in a frame.  Happens to be overlayed as shown, but it's look can change depending on positioning.  And it is actually an aberration, if you want to look at it that way.  Even Alice's black rectangle can be made to "disappear".
screenshot - same results with Firefox
(There are other Flash anomalies though not sure if they are this bug too, or can be fixed by whatever ends up fixing this bug, and are more typified by bugs like: Bug 612057 Bug 612154 Bug 612145 )
Perhaps even Bug 580159 & Bug 591020 are related.
This bug is also reproducible at and I have also encountered it on

Do the following using Windows 7 and then Windows XP:
1. Start with a new profile
2. Disable hardware acceleration and restart (I'm not sure if this matters)
3. Visit:
4. If prompted to "Please select your province," choose "British Columbia"
5. In the absence of this bug, you should now see large headings that include: "Plans", "Clear Choice Voice & Data Plans", "Clear Choice Voice Plans", etc.
a) On Windows 7, note that flash background is black (it should be transparent)
b) On Windows XP, note that flash is completely white (it should have text)
6. Disable IPC plugins and try again.  Notice the page now looks like it should.

Compare with Goggle Chrome, Opera, and Internet Explorer, which all render the flash content correctly.

Regression pushlog:
Blocks: 596451
blocking2.0: --- → ?
Keywords: regression
I believe that this is a dup of bug 611698.
Yeah; gotta be.  Was hunting for that bug yesterday, but couldn't find it.  Thanks.
Closed: 14 years ago
Resolution: --- → DUPLICATE
blocking2.0: ? → ---
Product: Core → Core Graveyard
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