Hmm, I'll see what I can do about fixing the bug with enable media previews. I just fixed the issue with comments collapsing when you try to highlight text, try updating to 1.3.1. The config should be accessible in your user menu in the top right, I think I might move it into its own icon in the menu so it's more visible
Edit: It wasn't actually fixed in 1.3.1, but I have fixed it properly now