Examine source code of AstroStore Quick Add

{
  "manifest_version": 2,
  "name": "AstroStore Quick Add",
  "version": "1.0.9",
  "description": "This is a companion to the AstroStore.io web app. Use this extension to save bookmarks as you browse :)",
  "author": "Thomas Girgenti",
  "homepage_url": "https://astrostore.io",
  "icons": {
    "48": "cosmo-48.png",
    "96": "cosmo-96.png",
    "192": "cosmo-192.png"
  },
  "page_action": {
    "default_title": "Bookmark this page",
    "default_popup": "index.html",
    "show_matches": [
      "<all_urls>"
    ],
    "default_icon": {
      "19": "cosmo-19.png",
      "38": "cosmo-38.png"
    }
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+B",
        "mac": "MacCtrl+B"
      },
      "description": "Bookmark this page"
    }
  },
  "permissions": [
    "activeTab"
  ]
}