Examine source code of Save Tab URLs

{
  "manifest_version": 2,
  "name": "Save Tab URLs with Titles, Restore Later",
  "version": "0.1.2resigned1",
  "description": "Show, save and restore the URLs with Titles of all tabs of current browser window. Show as copyable plaintext. Save and restore from text file.",
  "homepage_url": "https://github.com/mnba/save-tabs",
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "contextMenus",
    "notifications",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "browser_style": true,
    "default_title": "URLs List",
    "default_popup": "popup/urls-list.html"
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c77ba6d8-0bd6-4567-85c3-ef680d03fd1c}"
    }
  }
}