Examine source code of TabReminder

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.3.14",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "tabreminder@extension.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "91.0"
    },
    "gecko_android": {
      "strict_min_version": "120.0"
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "alarms",
    "notifications",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background/index.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    },
    "default_title": "__MSG_browserActionTitle__"
  },
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/index.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  }
}