Hi, as other users also reported, tabs winddow and icon are gone and only reappaer after deactivation followed by reactivation of onetab. Furthermore, I suffer from the missing dark mode. Onetab is the only light window in my firefox which dazzles me. To create a dark skin would be as simple as adding an appropriate css file. On github e.g. an OneTab-Night-Mode is already available but is is not possible to modify an extension due to certificate restrictions by Mozilla. I am afraid I have to abandon the onetab extension for this reason. Nevertheless, the ideas behind this extension is still very good. Regards