Discreet invisible messenger for Facebook

manifest.json

{
  "manifest_version": 2,
  "name": "Discreet Facebook Messenger for office",
  "short_name": "FB->Outlook",
  "version": "1.1.2resigned1",
  "description": "Changes and hides the visual of the Facebook messenger page to appear like Outlook",
  "author": "Zuzana Zuzqa Koysova",
  "content_scripts": [
    {
      "matches": [
        "https://www.facebook.com/messages/*",
        "http://www.facebook.com/messages/*"
      ],
      "css": [
        "infoBox.css"
      ],
      "js": [
        "jquery-3.2.1.min.js",
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "imgs/icon16.png",
    "default_popup": "popup.html"
  },
  "web_accessible_resources": [
    "imgs/outlook/mailicon.png",
    "imgs/outlook/header.png",
    "imgs/outlook/leftpanel-top.png",
    "imgs/outlook/leftpanel-corner.png",
    "imgs/outlook/tab-icon.png",
    "imgs/icon16.png",
    "new_style.css"
  ],
  "icons": {
    "16": "imgs/icon16.png",
    "48": "imgs/icon48.png",
    "128": "imgs/icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5cda5d39-0383-4336-bcd5-d3e733f4de06}"
    }
  }
}