Suppose there's a website that switches its margins, changes its css, etc., and you don't like how it looks. What I'm looking for is a program that would allow me to instruct my browser (firefox 3) to read a section of the page source differently, say, the one that answers for background color (for example). So if a particular website has a tag <body bgcolor="#ffffff" text="#000000" id="styleguide-v2" class="fixed">, and I visit the website, the program would automatically alter that tag to whatever I want it to be altered to (say <body bgcolor="#ffffa0" text="#000000" id="styleguide-v2" class="fixed">, then pass the altered source to the browser to interpret. Or if there are browsers that come with such options built in.
Thanks to anyone who can shed light on this
