tab text seems to have inconsistent vertical alignment

[balupton]

[tj]

Hmm odd, thought I hid the icons (assuming that's what's messing with the line-height)

[agirton]

It looks like to remove the icon styles pseudo content needs to be an empty string. Also I don't think this selector works since the class of the tab is title icon js-icon. Happy to submit a PR to update those.