Can I run my own javascript on a (loaded) page?

Viewed 38072

Can I run my own javascript code in a browser when viewing a page?

For example I have page index.html. In that I want to run this javascript function

function myFunction()
{

 alert("Say Hi");

}

I want to call this function through some browser interface because I don't have access to the source code of the web.

4 Answers
Related