Hello World! The best thing about an app is the option to contact the developer and ask about something that is missing or not working properly or even a for a feature that is not available.
I got this mail from a guy from Canada asking for Dark Theme in WebSplitter. The cool thing was that dark theme was in the making before being asked for.
It will come at the next update later in May and will bring other improvements too. For example the back/reload/forward buttons will be visible only when available. Cleaner is always better. Dark theme means better battery life. So this is for you my friend from Canada. Enjoy.