1) Make filter list more user friendly to edit by adding a sort function (alphabetically by name, "contains" field, etc.).
2) Allow multiple filters to be selected to delete at the same time.
3) Make the delete button accessible at all times instead of having to scroll to see it.
4) Auto-generate a message when the same "contains" field is used to allow editing to eliminate redundancies.

I notice I have multiple filters set for the same "contains" field. Trying to edit these is a nightmare with hundreds of filters and a deplorable UI for the filters list.