Examine source code of Cookie BG Picker

{
  "manifest_version": 2,
  "name": "Cookie BG Picker",
  "version": "3.0",
  "description": "Allows the user to customize the background color and pattern of their sites. Also saves their preferences via cookies where possible.",
  "icons": {
    "48": "icons/bgpicker-48.png"
  },
  "permissions": [
    "tabs",
    "cookies",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "popup/images/bullseyes.png",
    "popup/images/starring.png",
    "popup/images/subtle.png",
    "popup/images/tactilenoise.png",
    "popup/images/triangles.png",
    "popup/images/triangles2.png",
    "popup/images/washi.png",
    "popup/images/whitey.png"
  ],
  "browser_action": {
    "default_icon": {
      "32": "icons/bgpicker-32.png"
    },
    "default_title": "BG Picker",
    "default_popup": "popup/bgpicker.html"
  },
  "background": {
    "scripts": [
      "background_scripts/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts/updatebg.js"
      ]
    }
  ]
}