Examine source code of Profile Picture Viewer

{
  "manifest_version": 2,
  "name": "Profile Picture Viewer",
  "version": "1.0.10.1",
  "description": "Profile Picture Viewer",
  "page_action": {
    "default_icon": "icons/19.png",
    "default_title": "Unlock full size profile picture"
  },
  "author": "Adem Kouki",
  "permissions": [
    "contextMenus",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "https://*.facebook.com/*",
    "https://*.instagram.com/*",
    "https://*.tiktok.com/*",
    "https://www.messenger.com/t/*"
  ],
  "background": {
    "scripts": [
      "contextmenu.js",
      "facebook.js",
      "instagram.js",
      "tiktok.js"
    ]
  },
  "homepage_url": "https://github.com/Ademking/fb-profile-picture-viewer",
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b5f95775-11af-4d7a-ae1c-e219e16feda2}"
    }
  }
}