Have just tripped over an issue whereby Firefox is not rendering row/cell borders correctly.
To illustrate the problem run the following dojo in Firefox
On opening the popup you should see that alternate rows are missing a bottom border and the first column is missing the right border (see Firefox.png).
Under Chrome & Edge these borders are being rendered correctly (See Chrome.png).
Is this a known issue with Firefox and if so are there any methods/workarounds to overcome the problem.