Last Comment Bug 635207 - Black rectangle appears on due to HTML5 Extension for Windows Media Player
: Black rectangle appears on due to HTML5 Extension for Wind...
Product: Firefox
Classification: Client Software
Component: Extension Compatibility (show other bugs)
: Trunk
: x86 Windows 7
-- normal (vote)
: ---
Assigned To: Nobody; OK to take it and work on it
Depends on:
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Reported: 2011-02-18 04:49 PST by Rakshith
Modified: 2011-02-19 04:56 PST (History)
3 users (show)
See Also:
Crash Signature:
QA Whiteboard:
Iteration: ---
Points: ---
Has Regression Range: ---
Has STR: ---

Black Rectangle (535.17 KB, image/png)
2011-02-19 03:03 PST, Rakshith
no flags Details

Description User image Rakshith 2011-02-18 04:49:34 PST
User-Agent:       Mozilla/5.0 (Windows NT 6.1; rv:2.0b12pre) Gecko/20110217 Firefox/4.0b12pre
Build Identifier: Mozilla/5.0 (Windows NT 6.1; rv:2.0b12pre) Gecko/20110217 Firefox/4.0b12pre

A Black rectangle Appears At The Left Of the screen

Reproducible: Always

Steps to Reproduce:
1.go to
2.A Black rectangle Visible On the left hand side of the screen
Actual Results:  
A Black rectangle is visible on the left hand side of my screen

Expected Results:  
Loaded The Expected content on that particular area

When the site was first open when IE 9 beta was released, It worked fine with minefield then.
Comment 1 User image Ed Morley [:emorley] 2011-02-18 06:09:34 PST
Works for me using Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b12pre) Gecko/20110217 Firefox/4.0b12pre ID:20110217123853

Could you see if the issue occurs with a new, empty profile:

Also, can you try turning off hardware acceleration in prefs, restarting Minefield and seeing if that makes a difference.
Comment 2 User image Raul Malea 2011-02-18 08:49:41 PST
Comment 3 User image Rakshith 2011-02-19 03:03:09 PST
Created attachment 513725 [details]
Black Rectangle
Comment 4 User image Ed Morley [:emorley] 2011-02-19 03:09:17 PST
Can you also please see comment 1.
Comment 5 User image Rakshith 2011-02-19 03:20:36 PST
new profile with hardware acceleration worked
Comment 6 User image Ed Morley [:emorley] 2011-02-19 03:26:25 PST
What fixed it though?

The new profile, or turning the hardware acceleration on vs off? (Please test both separately).

If it was the new profile, please go back to the old one and disable addons/plugins a couple at a time until you can narrow down what the cause was.

Comment 7 User image Rakshith 2011-02-19 03:33:41 PST
the new profile, Hardware acceleration has no effect.
Comment 8 User image Ed Morley [:emorley] 2011-02-19 03:41:57 PST
When you have a chance to try disabling the addons/plugins one by one, please post back with which one caused the problem - thanks!
Comment 9 User image Rakshith 2011-02-19 04:21:24 PST
Its HTML5 for windows media plugin 1.0 that's causing the problem
Comment 10 User image Ed Morley [:emorley] 2011-02-19 04:56:11 PST
Thanks for the update.

Since this is not a bug with Firefox, marking as invalid.
However, I will post a link to this bug on the blog post here: that hopefully the addon gets fixed.

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