Any flash video will cause firefox to hang.



External Software Affecting Firefox
Flash (Adobe)
7 years ago
6 years ago


(Reporter: svin83, Unassigned)


Firefox Tracking Flags

(Not tracked)





7 years ago
User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.53 Safari/534.3
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv: Gecko/20100914 Firefox/3.6.10 ( .NET CLR 3.5.30729; .NET4.0E)

Video will start to play, video will stop moving as firefox becomes VERY unresponsive. Only thing I can do is to kill the process.
Other flash content sometimes shows up as a gray square confirming there's an error, and that i should reload the page.

Reproducible: Always

Steps to Reproduce:
1. Install Firefox 3.6.4 or later
2. Watch Youtube (or other flash embedded) video
Actual Results:  
Firefox hangs.

Expected Results:  
duh. Video playing like in chrome or internet exploiter.

Happened first time after i updated firefox to the one with crash-protection-separate-plugin-thing-a-ma-jiggy...

If I pause the video before it starts playing(while still caching) firefox won't hang. Then it hangs the second I press play.

If I kill the plugin-container.exe in task manager, forefox starts working again, but flash is disabled, and the gray box comes up saying "The Adobe Flash plugin has crashed. No report available. Reload the page to try again."
Do you already tried ?
Which Flash version ?

Playing flash videos on youtube is working fine for me with FF3.6.X and SM trunk on win7 with Flash 10.1 r82


7 years ago
Component: Extension Compatibility → General
QA Contact: extension.compatibility → general

Comment 2

7 years ago
In safe mode, it does indeed not freeze but play videos fluently. I can only imagine it's an addon that's causing this. Maybe AddBlock Plus? Svin83, did you deactivate all addons and try again?
In any case, I do confirm that once this update was installed, video and general flash playing was almost impossible on firefox, so while this might be the direct result of a (very popular) addon (as I only have, it's certainly an indirect result of the update. 
My specs: Win7 64 bit, Core2Duo 2.2GHz, NVidia 8600m GT, 2GB ram.

Comment 3

7 years ago
When i started Firefox in safe mode, it didn't hang at first, but after I played a few videos it stopped responding, and in taskmanager cpu usage for firefox was 0%, then I waited for it to either start responding or throw me an error, and the thing crashed again...


7 years ago
Version: unspecified → 3.6 Branch

Comment 4

6 years ago
does it happen with current versions of firefox and flash?
Component: General → Flash (Adobe)
Product: Firefox → Plugins
QA Contact: general → adobe-flash
Whiteboard: [closeme 2012-04-15]
Version: 3.6 Branch → unspecified

Comment 5

6 years ago
Resolved per whiteboard
Last Resolved: 6 years ago
Resolution: --- → INCOMPLETE
Whiteboard: [closeme 2012-04-15]
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