Examine source code of Paraphrasing Tool

{
  "manifest_version": 2,
  "name": "Paraphrasing Tool",
  "version": "1.0.1",
  "description": "Paraphrasingtool is the perfect tool for people who struggle with rephrasing, or want to be better at paraphrasing",
  "homepage_url": "https://paraphrasingtool.ai/",
  "icons": {
    "48": "logo-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox_addon1@paraphrasingtool.ai"
    }
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "scripting"
  ],
  "browser_action": {
    "default_icon": "logo-48.png",
    "default_title": "Paraphrasing Tool",
    "default_popup": "popup/index.html"
  },
  "background": {
    "scripts": [
      "index.js"
    ]
  }
}