Yea, no. I have had severe mistrust of wowhead and their sense on ads (pun intended) since around Mid-late cataclysm I think. The rest of the site has also been on a steady decline. The one reason I sometimes revisit? Comments. Those are often invaluable. But sometimes not even there on more obscure things.
Leaving the site open in the background, even with the same addon you mentioned makes my memory usage soar. Chrome itself using up 8 GiB ram across all its split executables.