Version for Dark Window Themes Rated 3 out of 5 stars

Here is a modified version with White text so the title will show up on window borders when using dark themes.

For those curious, the change was to add :
cx.fillStyle = "rgb(255, 255, 255)";

Right after :
cx.font = 'message-box';
cx.fillStyle = '-moz-MenuBarText';
cx.textBaseline = 'middle';

In :

This review is for a previous version of the add-on (1.6.1-signed.1-signed).