Now that you mention it..that happened to me too. I forget what site I was on. do you have a link to ublock?
https://github.com/gorhill/uBlock/wiki
Ideally you'd install that through the chrome extensions but if you scroll down to the Install From section you should find what you need.
There was a giant slap-fight way back and Origin is the open source non-commercial non-extortion version of ublock/adwhatever and all those that let advertisers pay to get through their blocking wall.