I spent a few weekends building a Firefox browser extension because I was tired of my new tab page doing absolutely nothing useful. The result: Weather & Clock Dashboard — a replacement new tab that shows live weather, a 3-day forecast, and clocks for any cities you care about. What it does Live weather : Current conditions with temperature, humidity, and feels-like for your location 3-day forecast : See what's coming so you can actually plan your day World clocks : Multiple cities displayed in real time — great for remote teams across time zones Search bar : Quick search without switching tabs Dark/light mode : Respects your preference, toggles with one click Why I built it I was using Firefox's default new tab (tiles of recent sites). It told me nothing useful at a glance. I wanted something that answered "should I bring an umbrella?" and "is my colleague in London even awake yet?" in under a second, without switching apps.…