Apologies in advance for the off topic, but what the hell is with that web site? I double-click a term on the page to highlight it for a search and it changes

Apologies in advance for the off topic, but what the hell is with that web site? I double-click a term on the page to highlight it for a search and it changes the font size. I move my mouse to the left because that's where I put my tabs and a menu pops out. They're trying to be clever but it's just incredibly frustrating.