User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624 If the pages contain flash/shockwave presetations and mozilla has plugins installed, after few hours of use, CPU load reaches 99% when nothing is being done in the browser and stays there. The system becomes unusable for other things. So, normally I rename stuff in plugin dir, reload all tabs and open an IE for sites(e.g. comcast.net, my email site) which have all their content accessible only as shockwave/flash presentation. I hate to use IE and that's why I am logging this bug. Reproducible: Always Steps to Reproduce: 1. Open few yahoo pages which have shockwave/flash ads(actually most have them). Also visit comcast.net. 2. Use browser as you normally would. 3. After few hours of use, CPU load reaches 99% when nothing is being done in the browser and stays there. 4. Goto plugins directory and rename or remove libraries, so plugins are ineffective. Now reload all tabs. Idle CPU usage comes down to 3-4%. Actual Results: After few hours of use, CPU load reaches 99% when nothing is being done in the browser and stays there. The system becomes unusable for other things. Expected Results: Constant CPU usage should never be allowed to go beyond a threshold like 10%. Whether it is thru some sort of periodic self-check & destroy spinning on CPU threads or user initiated plugin disabling. Mozilla can provide one-button disable feature for all plugins, instead of user going to plugins directory and renaming the plugins. This is a major concern because most sites have started offering their contents as shockwave/flash presentations and I have to use IE to get decent performance on my system. This behaviour reproduces on W2K and Linux with latest released version of the mozilla browser. I wish I had enabled dump support so I could provide you some dumps.
I've been having the same problem. The build I'm using is: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7b) Gecko/20040421 Shockwave Flash 7.0 r19 There is an interesting behavior to note. CPU usage is a just under 30% when the flash object is covered by another window, or scrolled out of the visible area. When the object is visible, and the mouse is not over it usage floats in the 70 - 78% range. Bringing the mouse over the object usage shoots to almost 100%. Currently http://news.com.com/ has an Intel Flash ad at the top right of the page that produces this problem. The same page in IE6 does not have this issue. I don't know if this is a browser or a plugin issue. The bug should be confirmed
Looks like a dupe of bug 238935, which has more comments than this one.
it seems multiple flash ads contribute to 99% CPU usage such as in this page http://news.teamxbox.com/comments/8015/Microsoft-Announces-Publishers-Committed-to-Deliver-Content-for-NextGeneration-Xbox-Platform/ I'm on a trunk build, Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b2) Gecko/20050406 Firefox/1.0+
*** This bug has been marked as a duplicate of 238935 ***