One feature I’ve missed since abandoning NetCaptor for Firefox a few years ago was the ability to open new tabs next to the current tab instead of at the end of my tab stack. I spent an hour white-boarding this with Firefox dev Ben Goodger, and I gave up trying to do this myself after finding the Firefox tab-ordering code to be a spaghetti-mess of independent arrays.
I don’t remember how I stumbled on Tabs Open Relative… but all is well in my tabbed browsing world again — as if some annoying background music is gone. Ahhhhh.
Why is this feature so important? Context. When you open new tabs, they tend to be related to the current tab. If I’m searching Google for digital camera reviews and open the top five links as separate tabs, those tabs should be close to the “starter” tab, not lost at the end.