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Add-On was not installed :-(

But if I have to carefully highlight the link first I might as well copy and paste it into an open Firefox tab which I keep always ready for cases like this.

Rohrpostix

Это отзыв для предыдущей версии этого дополнения (3.5.1). 

Well, yes. URL Link is not for “just” opening links, it is for fixing broken links (split across lines) and custom manipulation of links to do other things with them.