Rated 4 out of 5 stars
You should to add an option for an url redirection to anonymity services or proxies (as the example, anonym.to, which removes referrer). Because these links are made inactive for some reason, and authors of the posts did not want to leak information about the links through referrers.
On the other hand, this option will be useful to the users of your extension.
Simple substitute found urls to %URL%:
And add an ability to change the address of service (to edit it).