Sometimes I need copy text to translate it, but I can't do it because text selection is blocked.
aha! I have the very solution for you!
http://en.lichess.org/forum/lichess-feedback/cant-copy-text-from-in---game-chat-boxWorth noting - it hasn't worked since I rebooted. Not sure how to make the change permanent.....
Before trying chunkymonkey's solution, could you please try hard-refreshing (Ctrl+F5) and then double-clicking on the text to see if it gets selected?