Examine source code of zBReviewBoard

{
  "name": "zipBoard",
  "version": "2.1.16",
  "description": "Enables screenshots for zipBoard",
  "homepage_url": "https://app.zipboard.co/",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "<all_urls>",
    "storage",
    "cookies",
    "unlimitedStorage",
    "webNavigation",
    "webRequest",
    "webRequestBlocking"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "css/zb-custom.css",
        "vendor/font-awesome/css/font-awesome.min.css"
      ]
    },
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "iframecontent.js"
      ],
      "css": [
        "css/zb-helpers.css"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "img/ZB_Logo_16x16.png",
      "24": "img/ZB_Logo_24x24.png",
      "32": "img/ZB_Logo_32x32.png"
    },
    "default_title": "zipBoard"
  },
  "web_accessible_resources": [
    "css/*",
    "vendor/jquery.js",
    "img/building-your-screen.gif",
    "img/faviconNew.png",
    "img/ZB_Logo_24x24.png",
    "img/tab.png",
    "img/desktop.png",
    "img/mic.png",
    "img/audio.png",
    "img/permission.png",
    "vendor/font-awesome/*",
    "img/ZB_Logo_128x128.png",
    "img/logo.png",
    "img/ZB_Logo_48x48.png"
  ],
  "icons": {
    "16": "img/ZB_Logo_16x16.png",
    "48": "img/ZB_Logo_48x48.png",
    "128": "img/ZB_Logo_128x128.png"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+Z",
        "mac": "Command+Shift+Z"
      }
    },
    "fullpage-screenshot-shortcut": {
      "suggested_key": {
        "default": "Ctrl+Shift+2",
        "mac": "Command+Shift+2"
      },
      "description": "fullpage-screenshot-shortcut"
    },
    "screenshot-shortcut": {
      "suggested_key": {
        "default": "Ctrl+Shift+1",
        "mac": "Command+Shift+1"
      },
      "description": "screenshot-shortcut"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@zbreviewboard"
    }
  }
}