In Safari 5.1, any links on the current page that are opened in a new tab are opened right next to the tab. That sucks.
This extension restores the pre-5.1 behaviour; all tabs are opened at the end of the tab list.
Here. If I ever have to release an update, I'll consider getting a public Git repository.
Did it break? Does it actually do what it's supposed to? Feedback appreciated at firstname.lastname@example.org.
Safari 5.1 also seems to close tabs to the left of the current tab. Luckily there's an extension for that.