Examine source code of BitDice extension

{
  "manifest_version": 2,
  "name": "BitDice official extension",
  "version": "1.13",
  "description": "This is official extension of BitDice. Using this extension, you can log in to our website quicker and get access to limited offers.",
  "icons": {
    "48": "bitdice.jpg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.bitdice.me/*"
      ],
      "js": [
        "bitdice.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "32": "bitdice.jpg"
    }
  }
}