Examine source code of Feedly Mini

{
  "name": "Feedly Mini",
  "description": "Easily add content to your Feedly while browsing",
  "author": "Feedly",
  "version": "1.0.12",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "appstore-mini@feedly.com"
    }
  },
  "icons": {
    "16": "16x16.png",
    "48": "48x48.png",
    "128": "128x128.png"
  },
  "browser_action": {
    "default_icon": {
      "19": "19x19.png",
      "38": "19x19@2x.png"
    },
    "default_title": "Feedly Mini",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "service-worker-bundle.js"
    ]
  },
  "permissions": [
    "activeTab",
    "identity",
    "scripting",
    "storage",
    "*://feedly.com/",
    "*://api.feedly.com/*"
  ]
}