
Senior Platform Engineer, WebExtensions
Work on the WebExtensions platform in Firefox to implement and maintain extension APIs and addon management, debug and fix extension issues, build related UI, contribute to Mozilla-owned extensions and system add-ons, and participate in open-source workflows. Requires 4+ years professional software development experience and strong proficiency with JavaScript, DOM APIs, HTML, CSS, and familiarity with browser architecture and debugging tools. Bonus experience includes Firefox internals, C++ or Rust, Android/GeckoView, and web security.













