Examine source code of sanjeman

{
  "background": {
    "persistent": true,
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "jquery-3.4.1.min.js",
        "html2canvas.min.js",
        "content.js"
      ],
      "matches": [
        "https://jobvision.ir/Employer/JobApplies/Search/*",
        "https://jobvision.ir/Resumee",
        "https://jobvision.ir/Resumee/Directory/ManageDirectories",
        "https://panel.jobinja.ir/*/posts/*",
        "https://panel.jobinja.ir/*/lists/is-favorite*",
        "https://panel.jobinja.ir/*/lists/has-note*",
        "https://www.irantalent.com/employer/folders/cv-folders/*",
        "https://www.irantalent.com/employer/search/cv-search",
        "https://karbank.ir/profile/*",
        "https://karboom.io/employer/jobs/resumes/*",
        "https://www.linkedin.com/in/*"
      ],
      "run_at": "document_start"
    }
  ],
  "description": "Send your selected CVs in your Sanjeman account. This extension is only available on some job boards.",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "manifest_version": 2,
  "name": "sanjeman",
  "page_action": {
    "browser_style": true,
    "default_icon": "icons/64.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "razmiwork@gmail.com"
    }
  },
  "permissions": [
    "*://*.mozilla.org/*",
    "tabs"
  ],
  "version": "2.2.0"
}