Examine source code of Bookmark It

{
  "manifest_version": 2,
  "name": "Bookmark It",
  "short_name": "The only extension that lets you create awesome bookmarks on your Youtube videos",
  "description": "The only extension that lets you create awesome bookmarks on your Youtube videos while showing you the best parts of videos.",
  "version": "1.5.12",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "index.html"
  },
  "icons": {
    "128": "icon.png"
  },
  "permissions": [
    "activeTab",
    "https://bookmark-it.happydevelopers.co/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.youtube.com/*",
        "https://bookmark-it.happydevelopers.co/*"
      ],
      "js": [
        "youtube.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "applications": {
    "gecko": {
      "id": "bookmark-it@happydevelopers.co",
      "strict_min_version": "55.0"
    }
  },
  "optional_permissions": [
    "https://*/"
  ]
}