Works well and allows really efficient work with CTRL and SHIFT mouseclicks on URLs.

The 'green' icon mode is very magic - but the description is not so intuitive: Perhaps rename the button tooltip from 'Turned on' to 'Auto-Split on' (as it does not control the overall add-on behavior, but just the 'auto' functionality).

I don't think this extension is as bad as other users have commented. It works exactly as described, and I haven't encountered any bugs. One thing to note is that it won't work if you're testing it on the https://addons.mozilla.org website.

Exactly what I was looking for: Great, thank you!
Only criticism: It would be great if you could assign a function key to open the corresponding site in the next window when you click on a link. E.g. control-shift-click would be great.