If anyone is interested in the source for such an extension, I made a similar one and open-sourced it: https://github.com/typpo/fb-unsee https://github.com/typ

If anyone is interested in the source for such an extension, I made a similar one and open-sourced it: https://github.com/typpo/fb-unsee https://github.com/typpo/fb-unsee It's less than 20 lines total!