Examine source code of Bang

{
  "name": "Bang",
  "version": "1.2.0",
  "manifest_version": 2,
  "description": "Shortcuts that quickly take you to search results on other sites. Example: !a shoes will take you to https://amazon.com/s?k=shoes",
  "homepage_url": "https://github.com/eykrehbein/bang",
  "icons": {
    "16": "icons/16.png",
    "64": "icons/64.png"
  },
  "web_accessible_resources": [
    "src/commands/commands.json"
  ],
  "permissions": [
    "tabs",
    "webNavigation"
  ],
  "background": {
    "scripts": [
      "src/bang.js"
    ]
  },
  "options_ui": {
    "page": "src/options/index.html"
  }
}