MacOS Firefox sometimes generates a blur while creating number edit

[lizardworks]

This issue is easily reproduced using the plunker from the tutorial (http://ui-grid.info/docs/#!/tutorial/Tutorial:%20201%20Edit%20Feature).

Open the tutorial in Firefox on a Mac.
Click "Edit in Plunkr"
Click to Run
Refresh live preview
Note that All but the age cells are easily editable using double click.
Note how double clicking on various age cells just highlights the cell and does not display the number edit.

This was found with Firefox version 61 on macOS 10.12.6.