I don't have any custom filters, but AFAIK it uses exactly the same format for its black lists. The "my filters" pages says: > A filter can be a plain hostname

I don't have any custom filters, but AFAIK it uses exactly the same format for its black lists. The "my filters" pages says: > A filter can be a plain hostname, or an Adblock Plus-compatible filter. Lines prefixed with ‘!’ will be ignored.