I would like to write a Firefox extension to send shared URLs to a
server. For example, you might designate cnn.com as a shared domain
so that any time you visit a page on cnn.com, the URL will be
automatically sent to the server.

For more on what I plan to do, see:


I am new to Firefox extension development. Is there a tutorial that
considers an example similar to what I would like to do (or that I can
easily adapt for this purpose)?

It seems there's quite a lot to learn and I don't know where to start.