To change the context menu as shown in the screenshot use the included userChrome file, check the add-on options page on how to install this.

Install

• License: GNU General Public License v3.0 or later
• Weekly downloads: 0
• Average daily users: 1
• Rating: 0/5 of 0 ratings
• Created: 2021-10-16 04:18:40
• Last updated: 2023-05-14 03:10:37
• Homepage:
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/open-image-in-old-tab/
• API: view-image@defkev