Examine source code of Key Navigate

{
  "name": "Key Navigate",
  "description": "KeyNavigate use keyboard input to navigate post images, etc.",
  "version": "2.0",
  "permissions": [
    "<all_urls>",
    "tabs",
    "scripting",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js?0"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.discord.com/*"
      ],
      "js": [
        "extra/jquery-3.6.0.min.js?0",
        "extra/content_common.js?0",
        "content_discord.js?0"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "extra/jquery-3.6.0.min.js?0",
        "extra/content_common.js?0",
        "content.js?0"
      ]
    }
  ],
  "web_accessible_resources": [
    "gpl-1.0.txt?0",
    "popup.html?0",
    "page.html?0",
    "page_chatmessages.html?0"
  ],
  "browser_action": {
    "default_icon": "default-64.png",
    "default_title": "Key Navigate"
  },
  "incognito": "spanning",
  "options_ui": {
    "page": "./options.html"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{428e7f18-75dd-46fd-9664-7d8d57922f4d}"
    }
  }
}