Examine source code of Waterfox

{
  "description": "Extension Starter Kit",
  "version": "0.1.0",
  "content_security_policy": "script-src 'self' ; object-src 'self'",
  "name": "Waterfox",
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "permissions": [
    "storage"
  ],
  "manifest_version": 2,
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_action": {
    "default_icon": "icon-16.png",
    "default_title": "Waterfox",
    "default_popup": "popup.html"
  },
  "chrome_url_overrides": {
    "newtab": "welcome.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://example.com/"
      ],
      "js": [
        "example.bundle.js"
      ]
    }
  ]
}