Salaam everybody: If you are interested in giving a dark theme to Shiachat (black background with light text), download the free "Stylish" add-on from Firefox (may be on other browsers too) by going to "Tools", then "Add-Ons", then click on "Get Add-Ons".  After downloading and restarting Firefox, the "S" icon should appear in your toolbar.  Click on that icon and go to "Find styles for this site", and then search for and download "Midnight Surfing - Global Night Style" (my preference, alth