Yes, I have, but not for Mirfield. I also have MOUNTAIN's in Flockton, a George married my Harriet NAYLOR. I'm going to try and look for your FIRTH's when I have some time ..... see message below at the end.
MOUNTAIN info:
Ann MOUNTAINE bap. 24 Dec 1759 Flockton, daughter of Major
Ninah MOUNTAIN bap. 24 Jan 1761 Flockton, daughter of Major
Elizabeth MOUNTAINE bap. 25 Nov 1763 Flockton, daughter of Major
Beatrice MOUNTAIN bap. 01 May 1768 Flockton, daughter of Major
Beatrice MOUNTAIN bur. 17 May 1768 Flockton, daughter of Major
Mary MOUNTAIN bap. 27 Aug 1772 Flockton, daughter of Major
John MOUNTAINE bap. 02 June 1776 Flockton, son of Major
Frances MOUNTAIN bap. 28 Feb 1778 Flockton, daughter of Major
I started trawling the pages at 1759 and I made notes of the names associated with your Major, from thereon so here's the info. I just hope you can sort it, as one thing does confuse me ...... a certain burial. Either, there are two Major MOUNTAIN's in Flockton round about the same time, both married to a Betrice or YOUR Major married again?
Betrice the wife of Major MOUNTAINE buried 22 August 1766 Flockton
Joseph the son of Major MOUNTAIN buried 14 Dec 1766 Flockton - no baptism entry between 1759 and this date, perhaps Betrice died in childbirth and Major never got around to having their son baptised?
Elizabeth MOUNTAIN buried 13 April 1781 Flockton
Beatrix MOUNTAIN bap. 26 Sep 1784 Flockton
I've stopped at 1784, but as soon as I have the time, I'll start again from there and see what else I can find. If you have any more info at all to help me, will you please tell me?