Examine source code of Scimago search engine

{
  "manifest_version": 2,
  "name": "Scimago search engine",
  "description": "Adds a search engine that searches scimagojr.com",
  "developer": {
    "name": "Endre Márk Borza",
    "url": "https://github.com/chponte/scimagojr-search-engine"
  },
  "version": "1.2",
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "Scimago",
      "search_url": "https://www.scimagojr.com/journalsearch.php?q={searchTerms}",
      "keyword": "scholar",
      "favicon_url": "icons/32.png",
      "is_default": false,
      "encoding": "UTF-8"
    }
  },
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png"
  },
  "web_accessible_resources": [
    "icons/32.png"
  ]
}