Really helpful and well managed extension which considers a lot of things. I would like to address 2 issues:
1) In pages where we have .svg files (mostly with black text written on them), the black background makes it really difficult to read the text. For eg. https://www.geeksforgeeks.org/page-rank-algorithm-implementation/
2) Some rendered elements of a page don't seem 'clickable' until the entire page is loaded, this gives a sense of latency of 2-3 seconds. Problem primarily faced on facebook.com ( especially on loading it for the first time of a session)