Examine source code of KJuicer

{
  "name": "Kjuicer",
  "description": "Readers get superpowers",
  "version": "1.4",
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "32": "images/kj32.png",
      "64": "images/kj64.png"
    }
  },
  "icons": {
    "32": "images/kj32.png",
    "64": "images/kj64.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "http://beta.kjuicer.com/",
    "https://beta.kjuicer.com/"
  ],
  "content_scripts": [
    {
      "js": [
        "scripts/base64-string.js",
        "scripts/lz-string.min.js",
        "scripts/content.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ],
  "background": {
    "persistent": false,
    "scripts": [
      "scripts/background.js"
    ]
  },
  "options_ui": {
    "page": "pages/options.html",
    "chrome_style": true
  }
}