It's MyTabs
Open source, web based, self hostable guitar/bass tab viewer
...It supports features like MIDI synth track muting/soloing, mobile-friendly UI, dark/light themes, and a variety of cursor modes (auto-scroll, follow-cursor, highlight bar). Because it is deployable via Docker Compose or as a Windows executable, musicians can self-host their own tab library, keep data private, and share links conveniently. The community around it includes home musicians praising it for usability and self-hosting flexibility.