The icon is based on Certificate By Karen Tyler
Certificate By Karen Tyler https://thenounproject.com/search/?q=certificate&i=531027

Your clipboard is read only if you interact with the extension. The data is not sent anywhere https://github.com/andreicristianpetcu/Base64CertificateViewer/blob/c7d684b57f6cdb9e838b55ed3b414e9b42cfabf9/app/scripts/background.js#L119-L135

This extension is 100% offline and data used is ephemeral. I don't need your clipboard data :) I built it so that I don't need to use sites like https://www.sslshopper.com/certificate-decoder.html

Install

• License: GNU General Public License v3.0 or later
• Weekly downloads: 4
• Average daily users: 120
• Rating: 4.5/5 of 4 ratings
• Created: 2018-02-20 19:42:11
• Last updated: 2019-01-27 12:00:09
• Homepage: https://github.com/andreicristianpetcu/Base64CertificateViewer/
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/certificate-viewer-for-humans/
• API: {13c639b4-1c39-478e-8f12-34f03412f43c}