FatApe provides support for GreaseMonkey userscripts. These scripts could be used for adding new features to web pages (for example, embedding price comparisons within shopping sites), fixing rendering bugs, combining data from multiple webpages, and numerous other purposes.
This plugin supports almost all of the API of GreaseMonkey and is compatible with most userscripts present “in the wild”.
FatApe usage is documented on the corresponding user guide page.