Privacy by Design: What Data My Firefox Extension Sends (and What It Doesn't)

When I built the Weather & Clock Dashboard extension for Firefox, I made a non-obvious decision early on: no analytics, no error tracking, no third-party anything except the weather API call. Here's what that actually means in practice. What data leaves the browser? Exactly one thing: your weather location. When you open a new tab, the extension makes a single HTTP request to Open-Meteo : GET https://api.open-meteo.com/v1/forecast?latitude=40.71&longitude=-74.01&current_weather=true.