Examine source code of TimeSnap - Quick timestamps for YouTube videos

{
  "manifest_version": 2,
  "name": "YT Time Bookmarks",
  "version": "3.1.0",
  "description": "Personal timestamp knowledge base for YouTube videos",
  "browser_specific_settings": {
    "gecko": {
      "id": "yt-time-bookmarks@example.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "*://www.youtube.com/*",
    "*://youtube.com/*"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/icon48.png",
      "96": "icons/icon96.png"
    }
  },
  "sidebar_action": {
    "default_panel": "popup/popup.html",
    "default_icon": {
      "48": "icons/icon48.png",
      "96": "icons/icon96.png"
    },
    "default_title": "TimeSnap"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*",
        "*://youtube.com/*"
      ],
      "js": [
        "content/content.js"
      ]
    }
  ],
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Alt+Shift+S",
        "mac": "Command+Shift+S"
      },
      "description": "Open/Close TimeSnap Sidebar"
    }
  }
}