Aza’s Thoughts » Rapid Prototyping with Greasemonkey

"In general, using the browser’s run-time as a prototyping environment enables ridiculously fast rapid prototyping. There are no deployment steps to worry about, changes are reflected instantly, and all changes are dog-foodable from the get-go. Prototyping is also entirely decoupled and parallelizable: that’s especially powerful when you don’t have access to the site for which you are making a live-patch, the backend code is obtuse, or when you multiple have competing ideas for changes you’d like to make. We actually use the same technique for prototyping new behaviors for the the Ubiquity code repository."