Hello everyone

Guys, do you know if it is possible to write a plugin for Opera browser that will preprocess html code before displaying it? Maybe there are some allready written?

I want to make a filter to hide all comments from specific users, because in livejournal you still can see in other blogs comments from people you banned.

I dont want to see a comments of my exgirlfriend when I read our common friends, I realy need this kind of filter.
Can anyone help me?