Please look at github for details and source code.
https://github.com/kakakikikeke/close-tab-right-click

Install

• License: Mozilla Public License 2.0
• Weekly downloads: 3
• Average daily users: 44
• Rating: 5/5 of 1 ratings
• Created: 2018-10-15 04:49:37
• Last updated: 2023-05-23 07:30:31
• Homepage: https://github.com/kakakikikeke/close-tab-right-click
• Support site and email
• Donate
• Orig: https://addons.mozilla.org/en-US/firefox/addon/close-tab-right-click/
• API: close-tab-right-click@kakakikikeke.blogspot.com