Examine source code of YT Account Manager

{
  "manifest_version": 2,
  "name": "YT Account Manager",
  "version": "3.6",
  "description": "YouTube Multi-Account Manager v3.3 – Link-Öffner, HD/FPS Unlocker, Multi-Account Commenter",
  "permissions": [
    "contextualIdentities",
    "cookies",
    "tabs",
    "storage",
    "activeTab",
    "alarms",
    "clipboardRead",
    "*://*.youtube.com/*",
    "*://*.google.com/*",
    "*://*.twitch.tv/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "YT Account Manager",
    "default_icon": {
      "48": "icons/icon.svg"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "hd_unlocker.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "commenter.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "commands": {
    "open-account-1": {
      "suggested_key": {
        "default": "Alt+Shift+1"
      },
      "description": "Account 1 öffnen"
    },
    "open-account-2": {
      "suggested_key": {
        "default": "Alt+Shift+2"
      },
      "description": "Account 2 öffnen"
    },
    "open-account-3": {
      "suggested_key": {
        "default": "Alt+Shift+3"
      },
      "description": "Account 3 öffnen"
    },
    "open-account-4": {
      "suggested_key": {
        "default": "Alt+Shift+4"
      },
      "description": "Account 4 öffnen"
    },
    "open-account-5": {
      "suggested_key": {
        "default": "Alt+Shift+5"
      },
      "description": "Account 5 öffnen"
    },
    "open-account-6": {
      "suggested_key": {
        "default": "Alt+Shift+6"
      },
      "description": "Account 6 öffnen"
    },
    "open-account-7": {
      "suggested_key": {
        "default": "Alt+Shift+7"
      },
      "description": "Account 7 öffnen"
    },
    "open-account-8": {
      "suggested_key": {
        "default": "Alt+Shift+8"
      },
      "description": "Account 8 öffnen"
    },
    "open-account-9": {
      "suggested_key": {
        "default": "Alt+Shift+9"
      },
      "description": "Account 9 öffnen"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ytmanager@accounts",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}