Javascript blocks selecting text: how to unblock?

If your using Firefox, get the noscript addon.

I've found solution in Chrome -> my own extension.

contentscript.js:

document.oncopy= function(){
    return true;
} 

document.ondragstart= function(){
    return true;
}

document.onselectstart= function(){
    return true;
}   

If you want to unblock it permanently, Right click > View source and copy the link to JavaScript file that's preventing the highlight. Add it to your adblock/blacklist extension, or even your hosts file (list of locations for each OS) like this.

127.0.0.1 http://incriminating.file/url.js

This will prevent the JavaScript file from being downloaded when you reload the page after clearing your cache. Bare in mind that your experience with the site might be handicapped with this method.