Examine source code of Whimsy

{
  "manifest_version": 2,
  "name": "Whimsy",
  "version": "3.2.1resigned1",
  "description": "Add some Whimsy to your Firefox! 🦄🌈",
  "homepage_url": "https://github.com/bwinton/whimsy/tree/webextension",
  "author": "Blake Winton <bwinton@latte.ca>",
  "contributors": [
    "Daniela Arcese",
    "Erica Wright"
  ],
  "icons": {
    "48": "icon.svg",
    "64": "icon.svg",
    "96": "icon.svg"
  },
  "applications": {
    "gecko": {
      "id": "jid1-6mUPixNFCjAgkg@jetpack"
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "bookmarks",
    "topSites",
    "contextMenus",
    "clipboardWrite"
  ],
  "background": {
    "scripts": [
      "background-scripts/background.js",
      "background-scripts/initialize.js",
      "background-scripts/mario.js",
      "background-scripts/urlbar.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icon.svg",
      "64": "icon.svg",
      "96": "icon.svg"
    },
    "default_title": "Whimsy"
  },
  "options_ui": {
    "page": "settings/options.html",
    "chrome_style": true
  },
  "omnibox": {
    "keyword": "whimsy"
  },
  "chrome_url_overrides": {
    "newtab": "newtab-page/newtab.html"
  }
}