List creation behaves strange in Firefox

[mondjunge]

Lists behave strange on Firefox after clicking List -> Ordered List (or Unordered, doesn't matter) , typing will add Vertical letter above the list. After hitting Enter it will continue horizontally as new paragraph under the list

Steps to reproduce the behavior:

1. Go to suneditor.com with Firefox
2. Delete Content of editor
3. Click on List -> Ordered List
4. Type text
5. Hit enter
6. Type text
7. See error