I recommend Obsidian with community plugins. Application itself isn’t open-source but your content stored as markdown files.
I personally use Traggo, but TimeTagger is also a great option: https://timetagger.app/articles/selfhost/
I just checked the manga artist’s site, he also posted the source PSD files of the chapters. Literally gigachad move.
Firefox is slower on synthetic benchmarks compared to Chromium ones but I’ve never seen a noticeable difference while surfing sites.
Multi-Account Container with proxy support is a killer feature for me. I keep Brave as fallback just in case for PWAs.
I’m actively using ollama with docker to run llama2:13b model. It’s generally works fine but heavy on resources as expected.