Examine source code of Brainly Searcher

{
  "manifest_version": 2,
  "name": "Brainly Searcher",
  "description": "This extension will add a option to search in brainly. By marcos10pc",
  "version": "1.0",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "contextMenus"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.brainly.pl/*",
        "*://*.brainly.com/*"
      ],
      "css": [
        "src/inject/brainly/inject.css"
      ],
      "js": [
        "src/inject/brainly/inject.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "/icon.png"
  },
  "background": {
    "scripts": [
      "brainlysearch.js"
    ]
  }
}