Examine source code of Geometry Calculator Basic

{
  "manifest_version": 2,
  "name": "Geometry Calculator Basic",
  "version": "1.0",
  "description": "A Geometry calculator is used to calculate the area and parameters of different shapes and figures, like circles, rectangles, squares, triangles, etc",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/geome-logo.png"
    }
  },
  "icons": {
    "128": "images/geome-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0aa82c44-fbb1-479f-a820-e41e5e7a8243}"
    }
  }
}