When I'm making fiddly changes to a web page I like to tweak the CSS using the Firefox Firebug plugin. It has the advantage of letting you try changes quickly and see the effect. The downside has always been that you had to then change the source CSS file to …
I ran across some "interesting" behavior of the Firefox Web Developer Add-on today. When editing JavaScript code I normally leave Web Developer set to "disable cache". This causes all images and, significantly for my purposes, the JavaScript files to be downloaded from the server on every page request. But I …