Integrate into the default web view via a browser extension or userscript

[JesseWeinstein]

It would be lovely to have this integrated into the default web view, as just another timeline that could be selected. And it could be added without having to get it pulled into the main codebase via a browser extension or user-script that modified the output after the fact.

I first saw this suggested here https://fosstodon.org/@OwenK/109599672267921749 and wanted to give it more visibility.