Examine source code of Bookmarker+ for YouTube

{
  "manifest_version": 2,
  "name": "Bookmarker+ for YouTube",
  "version": "0.2.1",
  "description": "Bookmark timestamps in YouTube videos. Markers on the progress bar AND a clickable list below the player.",
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-bookmarker-plus@local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "https://*.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "src/storage.js",
        "src/content.js"
      ],
      "css": [
        "src/content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "src/storage.js",
      "src/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "src/popup.html",
    "default_title": "YouTube Bookmarker+",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    }
  },
  "options_ui": {
    "page": "src/options.html",
    "open_in_tab": true
  }
}