Whether to draw a border around links.

Enables the color changing options.

Inverts colors on the view, i.e. black objects will be shown white.

Changes the paper's color, i.e. the document's background.

Changes the dark and light color to your preference, that means black will not be rendered as black but as the selected dark color and white will not be rendered as white but as the selected light color.

Converts the document to black and white. You can set the threshold and the contrast. Setting the threshold to a higher value by moving it to the right will result in lighter grays used.