Basic HTML view mode of Gmail do not support select all messages. So this addon will support it.

Install

• License: GNU General Public License v3.0 or later
• Weekly downloads: 2
• Average daily users: 157
• Rating: 5/5 of 7 ratings
• Created: 2016-05-22 23:50:42
• Last updated: 2017-12-08 22:40:07
• Homepage:
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/for-gmail-basic-html-view/
• API: @extension-for-gmail-basic-html-view