Examine source code of Firefuze

{
  "homepage_url": "https://www.firefuze.com",
  "name": "Firefuze",
  "version": "1.0.18resigned1",
  "manifest_version": 2,
  "description": "Share content and images from any webpage to Twitter, Facebook, Instagram and LinkedIn.",
  "icons": {
    "16": "app/shared/images/icon-16.png",
    "128": "app/shared/images/icon-128.png"
  },
  "background": {
    "scripts": [
      "app/scripts/jquery-3.2.1.min.js",
      "app/chrome/chrome-port-wrapper.js",
      "app/main.js",
      "app/shared/eyefiremetrics-bg-shim.js",
      "app/shared/eyefiremetrics.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "app/shared/images/icon-19.png",
      "38": "app/shared/images/icon-38.png"
    },
    "default_title": "Firefuze Extension"
  },
  "externally_connectable": {
    "matches": []
  },
  "permissions": [
    "http://*/*",
    "https://*/*",
    "contextMenus",
    "tabs",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "manifest.json",
    "app/shared/images/*",
    "app/shared/frame-container.html",
    "app/shared/frame-container.js"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "app/shared/overlay.css"
      ],
      "js": [
        "app/chrome/chrome-port-wrapper.js",
        "app/chrome/chrome-data-wrapper.js",
        "app/chrome/chrome-embed.js",
        "app/scripts/jquery-3.2.1.min.js",
        "app/shared/libs/postmessage.js",
        "app/shared/overlay.js",
        "app/shared/eyefire-hover-button.js",
        "app/chrome/chrome.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{983fe312-df99-4d0e-80e5-9752c3064b2d}"
    }
  }
}