Examine source code of Related pages

{
  "manifest_version": 2,
  "name": "Related pages",
  "version": "0.2",
  "description": "Show related pages of current page, such as bookmarks and history items in the same domain.",
  "icons": {
    "256": "icons/logo-256.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "60.0",
      "id": "{3dd93f7f-b0fb-4c8b-8b70-ce2b2ccf1fac}"
    }
  },
  "permissions": [
    "activeTab",
    "bookmarks",
    "history",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/logo-256.png",
    "default_title": "Show related pages",
    "default_popup": "popup/list.html"
  }
}