Alright, I had to head over to the uBlockOrigin reddit for support on this one. Turns out that you can use this extension to set permanent filters that change CSS values on a website. And the pausing activity is part of a CSS style. This very well likely works with other ad blockers, but I haven’t tried anything but uBlockOrigin. Enter this code into the “My Filters” section of Settings and the blinking will stop 
online-go.com##.Clock:style(animation-name: none !important;)