如何在FireFox上使用Dark Reader消除页面之间的白屏飞溅？

I'm using the latest FireFox 73.0 on Ubuntu 18.04. And I'm using the DarkReader AddOn (Or here at GitHUB) at night, which takes care of automatically creating a dark background to reduce eyestrain. Except for some minor (well...) inconveniences, it works g...