Greasemonkey?
It is a Firefox extension so it would work with what you mentioned, but may not if you're looking for a more general method. Works on http:// by default but can also be made to work on file:// URLs.
Greasemonkey is similar to iMacros but manipulates the DOM tree and can insert arbitrary nodes.
I haven't used it, but it invariably comes up if someone goes looking for a method to fix broken websites outside their control.
Greasemonkey is similar to iMacros but manipulates the DOM tree and can insert arbitrary nodes.
I haven't used it, but it invariably comes up if someone goes looking for a method to fix broken websites outside their control.