Here's a Dark Mode theme for the new Oculus forums.
It still needs work, there's problems with the search screen and the post editing panel is quite broken. But I thought people would like a chance to try out what I've got so far.
Most pages of the forum are supported, it should be fine for reading. Just not searching and posting yet.
This was developed in Vivaldi using the Stylus plugin. I've tested it in Firefox, Edge and Chrome too, but not extensively. All seem to work the same.
This is a user.css file. It needs a plugin like Stylus to activate.
In the Stylus Manage screen, click on the gear icon on the Oculus Forum Dark Mode line to get settings for the theme. You can turn on/off signatures and thread previews, and stretch the forum content to fill the width of your browser.
Some preview pics:
I've been playing with greasemonkey a bit today, and I might have a partial solution to seeing if new posts have been made to threads you've already seen. I've got it recording reply count every time you visit a thread. Then when viewing the thread list for a board it checks each one's reply cont against the recorded value for that thread. If they don't match (new replies added since you last looked), it changes the thread title colour.
I may be able to get it to also notice threads with new replies since the first time the thread appears in the list, even if you haven't gone into the thread.
This isn't possible in CSS like the Dark Mode, so this one would be a separate script using Greasemonkey/TamperMonkey addons.