I'm a little confused because, irrespective of the browser you're using, the nature of a link is that you should normally be able to click on it to go directly to the required page. So, whether you're using Firefox or any other browser, the links you should see on any web page would normally be 'clickable'.
However, a few web sites sometimes deliberately disable the 'click through' function on links. This is done so that the websites, which the links go to, are unaware of the referring page. To bypass this, you can use a Firefox add-on known as 'Linkification':
http://tinyurl.com/39do2y
Incidentally, some people are confused as to why they can't get website URLs to hyperlink on AB. For example if i type this:
www.google.co.uk
it won't hyperlink. The trick is to always quote the full URL, including the 'http' bit, like this:
http://www.google.co.uk/
Chris