Malware ! , this extension damage to browser

It is nice and does what expected.
but it is extremely small on a big screen.
i cannot read the calendar.
an option to adjust width and height woud be very good.
also the icon dissapears on a dark background.


REVISITING This after 2 Month:
Nothing happened.
Making an addon is one thing.
making it better would be the next step.
answering to Firefox Users shows Caracter.