Steps to reproduce the issue

Activate the plugin "System - Additional Accessibility Features" and click on the floating blue wheelchair icon.

Expected result

Firefox should display the options "Grey Hues" and "Speech to Text" in the accessibility options menu too.

Actual result

Firefox doesn't show these two menu items. In Edge (Chromium) these are visible.

System information (as much as possible)

PHP Built On: Linux info 3.0 #1337 SMP Tue Jan 01 00:00:00 CEST 2000 all GNU/Linux
Database Type: mysql
Database Version: 5.7.30-log
Database Collation: utf8_general_ci
Database Connection Collation: utf8mb4_general_ci
Database Connection Encryption: None
Database Server Supports Connection Encryption: Yes
PHP Version: 7.4.14
Web Server: Apache
WebServer to PHP Interface: cgi-fcgi
Joomla! Version: Joomla! 4.0.0-beta6 Beta [ Mañana ] 7-January-2021 18:42 GMT
User Agents:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0
Microsoft Edge/87.0.664.75 64-bit (Chromium based)

Additional comments