Calendar has 22 categories and an option to add Custom Categories. However, any custom categories I have added whilst editing an entry only seem to get saved in that entry, not in the list. If I need to use that category again I have to enter it again - every time! It seems logical to me that adding a category means it gets to stay in the list and I'd also expect that it would then be sorted apha-numerically.

Is it possible to edit the category list somewhere in FF?