I’ve made extensive use of bookmarklet for Blosxom‘s wikieditish plugin. Essentially it works by providing me with a piece of JavaScript that I can bookmark, and then use to pick up headlines directly for blogging.
The trouble is, Firefox’s pop-up blocker seems to have an issue with such bookmarks. Not always, but about once a day it gets the idea that the wikieditish page summoned by the bookmarklet is an evil pop-up and must be blocked. And once it does this there’s no way of convincing it otherwise: all wikieditish bookmarklets will be blocked every time after that. Only shutting down and restarting Firefox corrects it, but that, needless to say, is a nuisance.
I’ve found only one reference to such behaviour elsewhere on the net, on what looks like a Firefox developer’s page, and even that is from way back in the beginning of 2005. Apparently the issue was even worse back then, and they’ve improved it over the years, but the bug is still there.