User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.6) Gecko/20040206 Firefox/0.8 Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.6) Gecko/20040206 Firefox/0.8 The presence of an idle Flash movie causes Firefox to use 7-10% of the CPU (1.33GHz G4). For an example, start Firefox clean and go to http://us.a1.yimg.com/us.yimg.com/a/td/tdw/yho-300x250-acqinv-c126.swf, then right click and turn "play" off. Monitor Firefox's CPU usage using top or Activity Monitor. Since the Flash isn't playing, and Firefox isn't showing any other pages, it should use little to no CPU. The problem manifests whether the Flash is on a visible or invisible tab, and whether Firefox is visible or hidden. If you close the page containing the idle Flash, Firefox returns to using only 1-2% of the CPU (still more than it should: why doesn't it just yield?) This is a problem for laptops, where greater CPU usage means shorter battery lifetimes. Reproducible: Always Steps to Reproduce: See "details", above. Actual Results: See "details", above. Expected Results: See "details", above.

q1@lastland.net, can you also reproduce this using Mozilla?

(In reply to comment #1) > q1@lastland.net, can you also reproduce this using Mozilla? I haven't tried; I have no Mozilla installation. I'll try it, but please recommend a version to install.

Try a current nightly build for testing purposes. You should also try a current Firefox nightly build.

(In reply to comment #3) > Try a current nightly build for testing purposes. You should also try a current > Firefox nightly build. I've tried FireFox "Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7) Gecko/20040531 Firefox/0.8.0+", and it uses between 4-5% of the CPU under the same circumstances. I haven't tried raw Mozilla yet. BTW, this is on OS X, for which nightly builds aren't always available.

The following Flash, when idle (right click, turn off "play" and "loop"), makes FF use 45-50% of the CPU. http://us.a1.yimg.com/us.yimg.com/a/di/discovery_comm/yahoo_120x600_out_060204.swf

OK, I've tried this with Mozilla. It (Mozilla 1.7 Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7) Gecko/20040514) works the same way.

I confirm the problem on Windows too. I found this bug, and so i won't create another one. I got Mozilla 1.7.3 on Win2000. This happen frequently if you go on yahoo pages. So my computer might be stucked consuming 50% of cpu i read some news and forget to close the tags or/and the windows.

*** This bug has been marked as a duplicate of 106397 ***