Something weird I've noticed in Firefox lately -- and been wondering if it's related to these sorts of features -- is that if I leave Firefox open for a relatively long time (e.g. a few hours) NoScript will show whatever my search engine is set to as a script injection on all pages (with a "sidebar?" note). This happens even if I do not interact with the browser during that time. If I restart Firefox, then it goes away (until a long period of time elapses again).

Anyone have insight on why that's happening?