Some websites block the UI thread




8 years ago
7 years ago


(Reporter: Zhang Jingke, Unassigned)


Firefox Tracking Flags

(Not tracked)


(Whiteboard: [CLOSEME 2011-1-30], URL)



8 years ago
User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv: Gecko/20091016 Firefox/3.5.4
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv: Gecko/20091016 Firefox/3.5.4

When I open some flash website (e.g., the firefox becomes extremely slow after 2 or more flash were opened.

My firefox is 3.5.3 version. 

Reproducible: Always

Steps to Reproduce:
1.Launch the website
2.Open one flash in tab
3.Open the second flash in tab
4.The firefox may be much slower than before. 
Actual Results:  
When 2 flash files were opened, the firefox is slow.

Expected Results:  
At least 5 flash files should be able to be launched at one time.

Comment 1

8 years ago
Another case:
(1) Open "" and play the flash of it
(2) Close browser, then you will find the flash still keeps playing even
browser UI is invisible
(3) Click browser application icon to try to launch browser again
(4) There will show a dialog saying browser is already running, but in fact you
can not see it (can not see browser UI)
Reporter, are you still seeing this issue with Firefox 3.6.13 or later in safe mode? If not, please close. These links can help you in your testing.

You can also try to reproduce in Firefox 4 Beta 8 or later, there are many improvements in the new version,
Whiteboard: [CLOSEME 2011-1-30]
No reply, INCOMPLETE. Please retest with Firefox 3.6.13 or later and a new profile ( If you continue to see this issue with the newest firefox and a new profile, then please comment on this bug.
Last Resolved: 7 years ago
Resolution: --- → INCOMPLETE
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