Examine source code of FocusJUMP

{
  "description": "stop wasting your time looking for what you are looking for, JUMP THE WEB !",
  "manifest_version": 2,
  "name": "FocusJUMP",
  "short_name": "jump the web",
  "version": "3.2.3",
  "author": "Sébastien AUBRY",
  "homepage_url": "https://sebastienaubry.pagesperso-orange.fr/focusjump/",
  "icons": {
    "48": "icons/fj.png"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "focusJUMP.js",
        "js/fjFind.js"
      ],
      "css": [
        "css/main.css"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "mailoop@yahoo.com",
      "strict_min_version": "48.0"
    }
  }
}