Examine source code of Tab Manager for Mobile

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.18.1",
  "default_locale": "en",
  "icons": {
    "32": "icons/tabManager.png"
  },
  "applications": {
    "gecko": {
      "id": "tab_manager@utb.dip.jp",
      "strict_min_version": "58.0"
    }
  },
  "browser_action": {
    "default_icon": "icons/tabManager.png",
    "default_title": "Tab Manager"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "permissions": [
    "tabs",
    "storage",
    "clipboardWrite"
  ]
}