It was actually added about six months ago, blog post and all, but most people only heard about it once it was mentioned in the newsletter, which was last week.

I’d qualify the inclusion of FastMail because the mobile app doesn’t yet support the dark theme. (It will, it just doesn’t yet. There’s a fair bit of refactoring of the style system to make it work better pending.) Then again, half of the websites listed on this site depend on applying user styles or installing a browser extension…