Affected versions

• 88.0b7, 89.0a1(2021-04-03)

Affected platforms

• all

Steps to reproduce

1. Launch Firefox, access about:checkerboard

Enhancement suggestion

1. add spacing between the control buttons and section bellow (2-5 pixels might suffice);
2. update icon for forward/backward buttons to resemble one with another mode (different sizes);
3. icon for pause button, to resemble with the others from the set would need the lines to be smaller(in length);

Additional notes

• attached screenshot to illustrate the area.