Don't use this, see the Issues.

Currently, any link on facebook has the href https://l.facebook.com/u=LINK rather than just LINK. This is a WebExtension which fixes these links.

Installation (for Firefox)

You need to have the Developer Edition or the Nightly for this. You can use about:debugging to Enable Add-on Debugging and then Load a Temporary Add On by selecting the manifest.json here.

There is an easier way, by using the Install Addon From File inside about:addons. You need an XPI file for this which is available on request.