Examine source code of Firebird

{
  "manifest_version": 2,
  "name": "Firebird",
  "description": "Shows current tab's information including cookies and TPS stats.",
  "version": "0.1.0",
  "homepage_url": "https://github.com/carlobortolan/firebird",
  "browser_action": {
    "browser_style": true,
    "default_title": "List cookies in the active tab",
    "default_popup": "firebird.html",
    "default_icon": {
      "19": "icons/firebird.png",
      "38": "icons/firebird.png"
    }
  },
  "chrome_url_overrides": {
    "newtab": "append.html"
  },
  "icons": {
    "32": "icons/firebird.png",
    "48": "icons/firebird.png",
    "96": "icons/firebird.png"
  },
  "permissions": [
    "cookies",
    "<all_urls>",
    "tabs",
    "webNavigation",
    "storage",
    "topSites"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "54.0a1",
      "id": "{d4bcd3ee-6a90-43cb-b1d1-5fe5ce58ce5e}"
    }
  }
}