Examine source code of Simple Word Lookup

{
  "manifest_version": 2,
  "name": "Simple Word Lookup",
  "version": "1.0",
  "description": "Look up word meanings while streaming content on various platforms.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "https://*.youtube.com/*",
    "https://*.netflix.com/*",
    "https://*.primevideo.com/*",
    "https://*.hotstar.com/*",
    "https://*.jiocinema.com/*"
  ],
  "background": {
    "scripts": [
      "popup.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{82619491-6b61-49b7-a7ce-9cdb2746f40d}"
    }
  }
}