I was using that :(

You don’t need to use vscode, any text editor is fine. Try to follow the getting started tutorial on microsoft’s website to see if your dotnet configuration is correctly installed. https://learn.microsoft.com/en-us/dotnet/core/get-started

Jetbrains Rider free for personal use. You must use .net (core) on Linux, it works like a charm. Visual studio code is fine too but you need tons of plugins to have an IDE experience in .Net. You might have a problem with your .net installation id you can’t compile a simple program. How did you install .net? From microsoft’s ppa?

I don’t think Gecko is a requirement for the addons. The Orion Browser supports (many but not all) Firefox’s addons and its webkit. So it is feasible although probably hard to obtain a 100% compatibility. I still use Firefox on Ios because I prefer the UI but not all sites works well with it. Also the ios team at Mozilla is very small allegedly based on some public threads on the internet.

Don’t forget also the need to keep up with new web standards otherwise they will quickly become irrelevant due to not being able to go on new sites and I don’t think that will be possible without another company/foundation funding and taking over the project

Fraidycat is a cool RSS reader that let you organize your feeds in different frequency tabs so you don’t have the issue you just described