Create a Simple Web Extension [↗]
At Mozilla’s recent all hands event in Hawaii I set out to create my first web extension; I wanted the extension to be useful but simple, something with a real use case. In the end I created a very simple web extension that continuously monitors the document.title to replace foul words with asterisks, a safety measure to avoid embarrassment when sharing your screen or having people looking over your shoulder. Let me walk you through how simple creating a basic web extension is!
A good guide to creating your first web extension.