Examine source code of Time Restart

{
  "manifest_version": 2,
  "name": "Time Restart",
  "version": "2.3",
  "author": "Nacho Vazquez",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "TimeRestart@timerestart.ga"
    }
  },
  "background": {
    "scripts": [
      "timerestart/timerestart.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "dialog/open-dialog.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "homepage_url": "https://www.timerestart.ga/",
  "icons": {
    "16": "icons/reloj16.png",
    "32": "icons/reloj32.png",
    "64": "icons/reloj64.png",
    "128": "icons/reloj128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/reloj16.png",
      "32": "icons/reloj32.png",
      "64": "icons/reloj64.png",
      "128": "icons/reloj128.png"
    },
    "default_title": "Time Restart Reloaded",
    "default_popup": "popup/popup.html"
  },
  "web_accessible_resources": [
    "fonts/digital7.ttf"
  ],
  "permissions": [
    "notifications",
    "webNavigation",
    "tabs",
    "storage",
    "unlimitedStorage",
    "nativeMessaging"
  ]
}