Created attachment 8814 screenshot of Terminal with more than one tab, and the "Colors" tab of the preferences dialog It is currently very hard to distinguish the active tab from inactive ones, as the background colors of both types of tabs are greys that are quite close to one another. The "Colors" tab of the "Terminal Preferences" dialog does not include options to change either color. (See the attached screenshot.) My request is that such options be added to the dialog.
Distinguishing the active tab is on the GTK theme, not on the app. Adwaita, for example, uses a blue bar to indicate the active tab. Having said that, GTK provides a way to override your theme settings. The following will highlight the active tab in xfce4-terminal with light blue color: $ cat ~/.config/gtk-3.0/gtk.css #xfce4-terminal-notebook tab:checked { background-color: #c7d9eb; } In addition, xfce4-terminal allows setting tab label's color which also might be helpful.
Thanks, your suggestion worked. For the benefit of others who might be looking for the same solution: On my computer, there was no file ~/.config/gtk-3.0/gtk.css, but I created it with the content sugges ted by Igor. (I had installed some themes, but I did not need to edit ~/.themes/THEME_NAME/gtk-3.0.) After logging out and back in, the color of the active tab of xfce4-terminal was indeed light blue.