Examine source code of Split Desktop Extension

{
  "description": "Connect your browser with Split App.",
  "version": "2.14",
  "name": "Split Desktop Extension",
  "author": "split.co",
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Split",
    "default_icon": "icon.png"
  },
  "permissions": [
    "tabs",
    "webRequest",
    "cookies",
    "webNavigation",
    "storage",
    "http://*/*",
    "https://*/*"
  ],
  "icons": {
    "16": "icon.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "<all_urls>"
      ],
      "js": [
        "contentScript.bundle.js"
      ],
      "css": [
        "content.styles.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "content.styles.css",
    "icon-128.png",
    "icon-48.png",
    "icon.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "55.0"
    }
  },
  "manifest_version": 2
}