List creation not working in Firefox

It is difficult to create a list (numbered or bulleted) in Atto using Firefox.

Replication steps:

1. Create a page or edit some field using the editor
2. In an empty paragraph, click a list icon
3. Attempt to add text

Expected result: The text should appear with a bullet or number.

Actual result: The list icon/number disappears and appears and no text is written to the editor.