As mosses wrote, uninstalling the manually installed xpi file and installing the "lightning-extension" package solved this problem for me! Even *with* the Google Provider installed and enabled!
So I can consider this issue "closed" as well.
Thanks for the quick help.
As mosses wrote, uninstalling the manually installed xpi file and installing the "lightning- extension" package solved this problem for me! Even *with* the Google Provider installed and enabled!
So I can consider this issue "closed" as well.
Thanks for the quick help.