Examine source code of Get Link

{
  "manifest_version": 2,
  "name": "Get Link",
  "version": "1.6",
  "browser_specific_settings": {
    "gecko": {
      "id": "contact.shyptsolution@gmail.com",
      "strict_min_version": "65.0"
    }
  },
  "description": "Get Link is an Extension that allows users to easily open links from their mobile using Telegram and app on their PC and vice versa.",
  "icons": {
    "48": "icons48.png"
  },
  "permissions": [
    "identity",
    "tabs",
    "storage",
    "notifications"
  ],
  "sidebar_action": {
    "default_icon": {
      "32": "icons32.png"
    },
    "default_title": "Get Link",
    "default_panel": "popup.html",
    "browser_style": false
  },
  "browser_action": {
    "default_icon": {
      "19": "icons19.png",
      "38": "icons38.png"
    },
    "default_title": "Get Link",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "user_scripts": {
    "api_script": "oauth.js"
  }
}