About tab This should not be done as a tab, it is very much against the style of our preference tools. There is already an About menu item on the status icon. If you absolutely want to have an "About" in the preferences, it should be a left-aligned "About" button in the action area that brings up an about dialog. But I'd really just get rid of it.
This tab has been remove in upstream. Wait for next release.
The new release has been built.