Examine source code of Content Override & Watch

{
  "description": "Reload web content from files on disk when they are modified.",
  "manifest_version": 2,
  "name": "Content Override & Watch",
  "version": "0.2.0",
  "icons": {
    "64": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "cow@ki-dour.org",
      "strict_min_version": "80.0"
    }
  },
  "background": {
    "scripts": [
      "src/lib/utils.js",
      "src/lib/mapped_file.js",
      "src/lib/tab-handler.js",
      "src/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/content-script.js"
      ]
    }
  ],
  "options_ui": {
    "page": "src/options/options.html",
    "browser_style": true
  },
  "browser_action": {
    "default_icon": "icons/icon-disabled.png"
  },
  "permissions": [
    "<all_urls>",
    "nativeMessaging",
    "storage",
    "webRequest",
    "webRequestBlocking"
  ]
}