Since Tabliss stores your setting within your browser, some browser options and extensions can inadvertenly clear your Tabliss settings.
A known problem is the "Never save history" setting in Firefox that always run Firefox in privacy mode. This will prevent Tabliss from retaining your settings. We are aware this isn't ideal and are looking for a solution to resolve this in the future.
Try selecting "Reset to default" from the settings menu. If that does not work try the next item.
Welp, time to do a hard reset! Occasionally some strange edge cases I did not consider when building Tabliss come up and corrupt the internal data store. To fix this we will need to clear this broken internal data store.
Contact us at firstname.lastname@example.org and we will help you best we can.