I do recommend this addon; in general it works extremely well though there are a very few minor circumstances where it will obscure web page content. For example, at the time of this writing, if you open a review page on Etsy, it will show all reviews as 5-star but if you turn the reader off, it can be seen that it had simply changed all the stars in the same way. So sometimes I have to turn Dark Reader off, but very rarely.