Sometimes Firefox's textbox autocomplete gets in the way. WeBWorK is one example of where it's really annoying. With this Greasemonkey script, you can easily disable it on a page-by-page or site-by-site basis.
Just paste the following into a text document called "noautocomplete.user.js", and then drop it on Firefox (Sorry, if I remember, I'll make a downloadable version after I add attachments). You can then use Greasemonkey's interface to add "Included pages".
// ==UserScript== // @name Autocomplete Off // @description Lets you disable autocomplete on sites where it gets in the way // @include http://www.example.com/* // ==/UserScript== var inputElements = document.getElementsByTagName('input'); for (var i = 0; i < inputElements.length; i++) { var el = inputElements[i]; if (el.type != "text") continue; el.setAttribute("autocomplete", "off"); }