Thank you for the review. Also thanks for pointing out Night Mode Pro, I'm amazed by how well that extension compliments mine when using the "night mode" option that inverts the darkening into whitening.
That italics font issue doesn't seem to be dependent on my app, given that I don't have any special rules for italics. But I'll see if I can do something about it.

The new version is pretty much ready, coming with an options page where you can choose where to enable automatically (given a certain domain, URL, or simply a keyword), and a checkbox to just enable on every website altogether. Life is busy so It's been a long time coming. Expect it in a week or less - depending on the approval process time.