This is an awesome addon to Firefox. Unfortunately, the underlying service that it depends on is now closed, so this addon is now useless.

Simple but very effective

Thank you for this. It's exactly what I was looking for.

Works great! My only recommendation would be to run the target through a URL shortener before passing to Outline.com. This would make it work even on non-supported sites, like NYTimes.

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works perfect

As at Dec 2018 - it works brilliantly! Thank you very much!