Buttons open new windows instead of tabs

Clicking on share buttons opens a new browser window. How do I get it to open in a new tab instead?

I had another issue that forced me to disable labels, but I ended up liking them better without. The link text was black instead of white (as shown in the settings preview), and when you hovered on it, white underline appeared under black text. I was not able to change the color to white manually using custom CSS or by altering plugin files. The shortcode was entered into a footer text widget inside its own span.

Great plugin otherwise. Thanks.