Grid RowEditor in Firefox

[brokentwig]

I have a grid using the row editor plugin. I have a field that uses editor: 'textfield'. I click on the row and it enters edit mode. Now in IE (7-9) I can click anywhere inside the field to move the cursor, the End key on the keyboard works as well. In Firefox (6.0.2), the cursor is set to position 0 and the only way I can move it is using arrow keys. Is this a bug (in something) or is there a different editor type I can use?

[brokentwig]

Looks like the example RowEditor acts the same: http://dev.sencha.com/deploy/ext-4.0.2a/examples/grid/row-editing.html