Examine source code of Tab Sense

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "0.1.6",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "default_locale": "en",
  "incognito": "spanning",
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "browsingActivity",
          "websiteContent"
        ]
      },
      "id": "tab-sense@tenfyzhong.github.io",
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "tabs",
    "tabGroups",
    "storage",
    "notifications"
  ],
  "optional_permissions": [
    "https://*/*",
    "http://localhost/*",
    "http://127.0.0.1/*",
    "http://[::1]/*"
  ],
  "commands": {
    "close-duplicate-tabs": {
      "suggested_key": {
        "default": "Alt+Shift+D",
        "mac": "Alt+Shift+D"
      },
      "description": "__MSG_commandCloseDuplicates__"
    },
    "group-tabs-with-ai": {
      "suggested_key": {
        "default": "Alt+Shift+G",
        "mac": "Alt+Shift+G"
      },
      "description": "__MSG_commandGroupTabs__"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Tab Sense",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  }
}