Steps to reproduce the issue

In the joomla front end create a form containing a joomla-toolbar-button which contains a task="mycontroller.task" type attribute, and include in the contents of the joomla-toolbar-button, a button with a name/value pair.

Expected result

On pressing the button, the name/value pair should be sent to the server.

Actual result

In Firefox, the name/value pair are not sent to the server, whereas they are with Edge & Chrome.

If you omit the task="mycomponent.task" part of the joomla-toolbar-button, then Firefox seems to work ok.

System information (as much as possible)

Joomla 5.1.4, PHP 8.2.7, standard Linux box.

Additional comments