Examine source code of BLINK Add-on

{
  "name": "BL.INK Link Shortener",
  "description": "BL.INK creates short links that click with your audience. BL.INK creates branded links on your domain.",
  "version": "1.3.0",
  "manifest_version": 2,
  "browser_action": {
    "default_title": "BL.INK"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    "js/*",
    "BLINK-Web/*",
    "frame.html"
  ],
  "background": {
    "scripts": [
      "js/auth0chrome.js",
      "js/background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "https://login.bl.ink/oauth/token",
    "https://*.bl.ink/",
    "identity",
    "activeTab",
    "storage",
    "webNavigation"
  ],
  "options_page": "options.html",
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{0b19d01f-100b-4954-87f6-418ac4e3fbf3}"
    }
  }
}