Site don't work with activated addon
Don´t work on http(s)://www.myquix.de/QUIX
Only completly disabled the Addon help! The site don't reacts on inputs (Tarife) in the menu on the top.
The site does not reacts on inputs in the menu on the top (tarife ect). Disabled http everywhere over the menu don't help. You must completely disabled the addon to fix this issue.
Test with fresh installed FF 21.