This addon lets you edit any page! Press Shift+Alt+D to toggle document.designMode = 'on'/'off'. The logo is CC0 from here https://pixabay.com/en/pencil-pen-orange-red-eraser-190586/

Install

• License: GNU General Public License v3.0 or later
• Weekly downloads: 7
• Average daily users: 114
• Rating: 2.3333/5 of 3 ratings
• Created: 2017-04-02 12:42:39
• Last updated: 2017-04-03 01:29:17
• Homepage: https://github.com/andreicristianpetcu/toggle-document-design-mode
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/toggle-document-design-mode/
• API: {bb82f8a0-37a0-4609-b009-2cf4764e3ec5}