User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9a4pre) Gecko/20070409 Minefield/3.0a4pre Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9a4pre) Gecko/20070409 Minefield/3.0a4pre When the Software Update dialog is open, there's about 50% CPU usage even if it's doing nothing, i.e. waiting for me to click [Finish] (no update), or [Later] or [Download & apply update] (when there is an update). Reproducible: Always Steps to Reproduce: 1. Click Help->Check for update 2. Observe Firefox's CPU usage 3. Actual Results: ~50% CPU usage Expected Results: ~0% CPU usage