Examine source code of Background Color Change

{
  "manifest_version": 2,
  "name": "Background Color Change",
  "version": "1.0",
  "description": "Allows the user to change the background color of a paragraph to purple.",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{73f9be07-8f75-4051-be22-7d0f936cb750}"
    }
  }
}