Did you ever pay for a Chrome extension? If so what was it?

Donated to AdBlock a while ago.

I haven't ever paid for one. I only use a few basic plugins (Adblock Plus, JSON View, to name the top ones). I'm probably missing out on a lot of handy power-user functionality by not exploring plugins more, but I haven't felt the urge to scour what's available.

Yes. Dux Soup. :-)

Grammarly

https://chrome.google.com/webstore/detail/nordvpn-proxy-extension-p/fjoaledfpmneenckfbpdfhkmimnjocfa?hl=en
Nordvpn extension. I'm paying a subscription and I get more than just the extension, but like this it's very convenient and I don't have to install any programs on my computer.

Gmail checker plus => https://chrome.google.com/webstore/detail/checker-plus-for-gmail/oeopbcgkkoapgobdbedcemjljbihmemj

Didn't really need to pay, but I really liked the program and it let me use gmail as I want. I tried thunderbird, Polymail, Macos Mail, etc and liked none of them.