You accidentally typed gekeopadie.com into Firefox's address bar, and now it suggests that whenever you enter "ge." Remove mistyped URLs from the fox's suggestions by selecting the entry in the list and hitting Shift-Delete. This trick works for bad suggestions for username textfields also. Just start to type in into the form field until the grey dropdown appears, then use the cursor keys to move to the entry to be deleted and press the SHIFT key and the delete key. Voila!