@mapx- @okiehsch @gorhill I feel bad, I see an advertisement
https://imgur.com/I7TK3RM

Extension: uBlock Origin 1.18.8
Browser: on the 1th gif Waterfox 56.2.7.1 (64-bit) (on the 2th gif Waterfox 56.2.8 (64-bit)), but on Firefox 65.0.2 (64) the same situation
in (nasty) Opera everything is normal

@mapx- So that there is no misunderstanding and wrong criticism (from our last conversation) I completely deleted my entire Waterfox profile and created a new one, right before your eyes. Look https://imgur.com/2gGBhhs
And please do not say anything about other browsers. I checked in the opera there is no advertising. Cool. Surely in chrome, too, it is not. I am glad. But I am from this information neither cold nor hot. I do not want to use chrome. I am only interested in Firefox based browsers. Thank you for understanding.

I am a Slowpoke, it turns out there are already topics on reddit (although there is just a discussion):
https://old.reddit.com/r/uBlockOrigin/comments/b1845y/ublock_no_longer_working_on_twitch_screenshot/
https://old.reddit.com/r/uBlockOrigin/comments/b1kf2e/i_think_twitch_just_changed_their_ad_system/