Once in a while I find I can no longer unload tabs. Usually in these cases I go to about:addons and try to open the preferences page for unload-tabs. I get a page titled "Invalid context" with this text:
500 Fatal Error
This extension page can't be displayed in private windows, container tabs or other non-normal contexts.
Please try to open moz-extension://11a02ba0-9893-4795-9a93-437361cc5314/UnloadTabs?originalTab=220#options in a normal tab.
But this is a normal tab, not a container. I try to open that URL in another regular tab and get the same error.
If I disable and then re-enable the addon it starts working again: I can unload tabs again and I can get to the preferences page.
Once in a while I find I can no longer unload tabs. Usually in these cases I go to about:addons and try to open the preferences page for unload-tabs. I get a page titled "Invalid context" with this text:
But this is a normal tab, not a container. I try to open that URL in another regular tab and get the same error.
If I disable and then re-enable the addon it starts working again: I can unload tabs again and I can get to the preferences page.