Examine source code of Tabs List

{
  "manifest_version": 2,
  "name": "Tabs List",
  "version": "1.8",
  "id": "tab_lists@jonheard.com",
  "description": "Get text containing a list of urls for all tabs in the current window.  Can also open tabs from an existing text of urls.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "main.html"
  },
  "permissions": [
    "tabs",
    "storage",
    "clipboardWrite",
    "clipboardRead"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "58.0",
      "id": "tab_lists@jonheard.com"
    }
  }
}