Examine source code of TableCSV Converter

{
  "author": "igorlogius",
  "homepage_url": "https://github.com/igorlogius/tbl2csv",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_area": "navbar",
    "default_icon": "icon.png"
  },
  "icons": {
    "128": "icon.png"
  },
  "default_area": "navbar",
  "manifest_version": 2,
  "name": "Table to CSV",
  "description": "Save HTML Tables, CSS Pseudo/DIV Tables or Lists (UL/OL) as a comma seperated values (CSV) file which can be opened with any spreadsheet processor (e.g. excel, libreoffice-calc,gnumeric) for further processing and conversion (e.g. to xls or ods)",
  "permissions": [
    "clipboardWrite",
    "menus",
    "activeTab",
    "notifications"
  ],
  "version": "1.3.19",
  "browser_specific_settings": {
    "gecko": {
      "id": "{1244f624-e5a7-4248-b484-18f29e7cd4a7}"
    }
  }
}