Examine source code of Fedica

{
  "name": "Fedica",
  "version": "3.12",
  "description": "Fedica extension",
  "homepage_url": "https://fedica.com",
  "browser_specific_settings": {
    "gecko": {
      "id": "browserplugin@tweepsmap.com",
      "strict_min_version": "55.0"
    }
  },
  "permissions": [],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Fedica",
    "default_icon": {
      "48": "images/icon48.png"
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "popup.css",
        "twitter.css"
      ],
      "js": [
        "popup.js",
        "twitter.js"
      ]
    }
  ],
  "manifest_version": 2,
  "web_accessible_resources": []
}