Examine source code of Keybase

{
  "name": "Keybase",
  "short_name": "Keybase",
  "version": "1.10.17resigned1",
  "description": "A secure chat button for every profile.",
  "icons": {
    "48": "images/icon-keybase-logo-48.png",
    "128": "images/icon-keybase-logo-128.png"
  },
  "browser_action": {
    "default_icon": "images/icon-keybase-logo-logged-out-64.png",
    "default_title": "Keybase Chat",
    "default_popup": "html/popup.html"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "declarativeContent",
    "nativeMessaging",
    "storage"
  ],
  "web_accessible_resources": [
    "images/*",
    "fonts/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://reddit.com/*",
        "https://*.reddit.com/*",
        "https://twitter.com/*",
        "https://www.facebook.com/*",
        "https://github.com/*",
        "https://news.ycombinator.com/user*",
        "https://keybase.io/*"
      ],
      "js": [
        "js/bundle.js",
        "js/identities.js",
        "js/inject.js",
        "js/content.js"
      ],
      "css": [
        "css/fonts.css",
        "css/style.css"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "js/identities.js",
      "js/background.js"
    ]
  },
  "options_ui": {
    "page": "html/options.html",
    "chrome_style": true
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "keybase@keybase.io"
    }
  }
}