This project has not set up a SECURITY.md file yet.
Still, support for MV2 is the only way to go for older add-ons, and Firefox reiterated via an announcement today that it will continue to support it in the foreseeable future. "While some browsers ...
Open http://localhost:3000 with your browser to see the result. You can start editing the page by modifying app/page.js. The page auto-updates as you edit the file.