Examine source code of Page Color Changer

{
  "manifest_version": 2,
  "name": "Page Color Changer",
  "version": "1.0",
  "description": "Change the page color to blue.",
  "icons": {
    "48": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icon.png"
    },
    "default_title": "Change page color"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8adabdae-05ad-4ff5-8b37-1a6932ce6296}"
    }
  }
}