Don't Touch My Selection szerző: Kodigen

It prevents anti-selection event handlers like document.body.onselectstart or anti-selection styles like user-select: none from web pages.

How to use?
You just click "Prevent anti-selection" button (the extension icon on the top) on the web page that prevents to selection.

It's open source! https://github.com/iamdual/dont-touch-my-selection