Are you talking about version 2.2.0 or 2.2.1? 2.2.1 fixes it going off on doubleclicks in textboxes at least.

I know it's gotten a little oversensitive, but people also complained of previous versions that it didn't detect enough, because my code tried to decide on its own what is and isn't a URL. It was a maintenance nightmare that introduced a lot of acceptable edgecases that failed to work.
The compromise I've made now is that I let the browser decide what may or may not be a valid URL to try and open. That means virtually every kind of URL will work (like magnet, mailto, ftp, ssh, whatever you want), but it also means it will try to load a lot of things that are valid URLs but don't actually exist.

Using the "require shift key" option could lessen the pain until I find a way to improve this oversensitivity...

Sorry about this, but it's impossible to please everyone. I'm trying what I can.

Edit: you got me thinking and I may have a somewhat useful trick to reduce your problem: https://gitlab.com/Marnes/plain-text-linker/issues/8

Edit edit: I'm already publishing an update that should cut down the excessive tab opening a lot

Edit edit edit: it's already live :) Try updating now, it should be a lot better. Thanks for the constructive feedback and cooperation!