How to change a webpage client-side?

Question

There are a lot of webpages that I actually hate because of their design/lack of info.

Every time I open one of that page I would like to have an script that automatically changes from the original webpage to my already "hacked" webpage.

For example, changing the css completely, or adding some custom links somewhere in the page.

Answer 1

you could use Greasemonkey or Scriptish firefox extensions for the purpose. I guess similar addons exist for other browsers.

Answer 2

You could consider using Fiddler for this task by a Fiddler script .
Fiddler would act as proxy which would apply then the hacks.
This is a client side proxy and would support multiple browsers.