Instead of adding client credentials one-by-one, extension can also import all at once. Just download the template (link provide above). Or simply prepare an Excel sheet with column names exactly same as shown in screenshot. To import, select the data along with headers in Excel sheet, copy it and then paste it in Extension's import box.
Credentials can be backuped easily to any excel file. Steps to backup:
This project is under open source License. Source Code of this project is available on GitHub website which hosts public open source projects
https://github.com/dhananjay1405/tds-credential-manager-extension
Note: This extension stores credentials in the browser (of that PC) only. Credentials are not sent to any server ensuring it's safety. On clearing browser cache, credentials gets erased.
So we have made project's source code available