Examine source code of Color Changers

{
  "manifest_version": 2,
  "name": "Color Changers",
  "version": "1.5",
  "description": "Changes the background color of page to a color",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Change Color"
  },
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{812be672-208c-4e96-a6ef-7a63de1e3d44}"
    }
  }
}