Tabbing between fields in the options popup doesn't work as expected

[scottbedard]

Reproduction example 1

1. Open the options popup
2. Press tab down to the values field
3. Press shift + tab

Expected result
The focus should return to the placeholder

Actual result
Nothing happens

Reproduction example 2

1. Enter a couple of values
2. Focus a value and press tab / shift+tab

Expected result
The focus should move to next / previous input

Actual result
Focus jumps to the surrounding anchor tags