LinkThing2 is an extension that enhances your control over how links on web pages are opened. About the refactoring, briefly: The old LinkThing worked by basically taking over clicks on links and stopping them from doing what they were meant to do, so the extension could do something else instead. For example, if you had configured LinkThing to always open offsite links in a new tab, it would intercept any click on an offsite link, suppress Safari's default handling, and force the link's destination to open in a new tab. This was a pretty brute-force way of doing things. LinkThing2, by contrast, tries to achieve its goals while doing as little as possible. In the preceding example, LinkThing2 will just momentarily change the link's target attribute to _blank, let Safari do as it will, and then change the target back again. If your settings dictate that the resulting new tab should open at the end of the tab bar, LinkThing2 will only move it there after Safari creates it--instead of creating the new tab itself, as the old LinkThing did.
What's new in this version:
Horror of horrors, the open-links-in-new-tabs feature wasn't working at all, and I didn't realize it until now. But it's fixed now, hopefully.