Can't recommend that extension, for the reason you've already provided, it's a trial. Look into dark reader, it's the exact same thing, but for free. I personally use it on any site that I haven't made a theme for. The main different between this theme, and dark reader though, is that this is actually a theme, whereas those extensions just change some of the colours. This isn't just a dark skin, it changes the site's aesthetic completely. Also, thanks everyone for the bug reports and suggestions. No eta, but I'll try get an update out eventually.