Badge Color
Unfortuantely, the browser predetermines thefont size of the badge. Setting the badge text color is available in Firefox 63 and above.
Automatically set Badge Color
When checked, the text color is either white or black based on the highest constrast with the badge color. When unchecked, a manual color may be selected.
Badge Text Color (if not automatic)
This option is ignored/disabled unless "Automatically set Badge Color" is unchecked.
Icon Color & Style
Tab Counter Default
Tab Counter Gray 90 (Firefox Photon Design System Light Background Icon Color)
Tab Counter Gray 10 (Firefox Photon Design System Dark Background Icon Color)
Tab Counter Black
Tab Counter White
Clear SVG for Firefox (shows badge only)
Clear 1px PNG for Opera (shows badge only)
Counter
Number of Tabs in Current Window
Total Number of Tabs of All Windows
Both Number of Tabs in Current Window/Total Number of Tabs of All Windows
Total Number of Windows
None (disables the counter and hover text; click the icon to see the count)
A maximum of four characters can be displayed on the badge; this is a browser limitation.