Tabs2Text is a Mozilla Firefox and Google Chrome extension (addon) to export all of your opened tabs, from a browser window or from all windows, to a CSV, HTML, JSON or Markdown file type. It includes the tabs' title and URL information. For Firefox, last access data is also included (Chrome doesn't support it).
It was developed in a few days of COVID-19 quarantine to easily export all of my open tabs, and as a way to learn more about the Firefox API.
It can be installed directly from Firefox Addon page, or downloading the source code available here. See Debugging | Firefox Extension Workshop for information about debugging.
It can be installed directly from Chrome Web Store page.
See CHANGELOG.