{ "name": "My extension", ... "browser_action": { ... "default_icon": "images/icon32.png" // optional // equivalent to "default_icon": { "32": "images/icon32.png" } }, ... } Parts of the UI A browser action can have an icon, a tooltip, a badge, and a popup. Icon The browser action icons in Chrome are 16 dips (device-independent pixels) wide and high. Larger icons are resized to fit, but for best r