Question

I want to improve an existing website (I have no access to) by using my own javascript.

This means I have to add an < script > to the < head >. I am currently doing this by clicking on a bookmark which has something like this as its target:

javascript: if(document.createElement){
    void(head=document.getElementsByTagName('head').item(0));
    void(script=document.createElement('script'));
    void(script.src='http://local/script.js');
    void(script.type='text/javascript');
    void(head.appendChild(script));
} // i added some spacer to make it readable

This works fine, but since i’ve got a lot of different scripts it gets complicated to organize them.
I am now looking for a way to automatically insert a defined script-uri if the top.location.href matches a given string.
Is there a way firefox can do something like this – maybe with the help of an add-on?

Answer 1

Userscripts are what you’re looking for. Use Greasemonkey for Firefox to run your own script on specific sites.