Max Tabs is a simple Firefox extension that does these:

• Set a maximum number of tabs opened in a window.
• Control and restrict oneself from opening too many tabs.
• Prevent tabs from overloading and overflowing the tab bar.

Install

• License: Mozilla Public License 2.0
• Weekly downloads: 16
• Average daily users: 1157
• Rating: 4.2667/5 of 30 ratings
• Created: 2017-07-23 18:33:12
• Last updated: 2017-07-28 12:19:10
• Homepage: https://github.com/kanru/max-tabs
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/max-tabs-web-ext/
• API: max-tabs@kanru