This extension really slows down page loads. Firefox would show a warning about this extension taking a long time and if I wanted to kill it. Also, on newegg.com when loading or selecting different item option, the page would flash twice, like it was being redrawn 2 times.

Isn't there an option to only run this after the page has loaded? I know it needs to watch for dynamically loaded content. This was my favorite extension, it doesn't have these issues on Chrome.