Try disabling the CSS user-select
property
If you are not allowed to select text from a particular website, chances are they are using CSS to disable text selection using the property user-select
.
Using the inspect element window, locate this property on the CSS. If you find it, untick it to disable it.
If you try disabling JavaScript, as some people suggest, some websites may not open at all, so avoid doing that if you can.
If you need to change this property every time you access a website, consider using the Chrome Stylebot extension as an alternative.
Cheers.