The version in the Digital Tradition is almost Song #36 in More Irish Street Ballads, by Colm O'Lochlainn (1965). I've noted differences in bold or italics.

GOOD BYE MURSHEEN DURKIN

In the days I went a courtin', I was never tired resortin'
To the alehouse and the playhouse and many a house beside,
But I told me brother Seamus I'll be off now and grow famous,
And before I come home again I'll roam the world wide.

CHORUS
So good-bye Mursheen Durkin,
Sure, I'm sick and tired of workin',
No more I'll dig the praties, no longer I'll be fooled.
But as sure as me name is Corney,
I'll be off to Californy,
And instead of diggin'praties,
I'll be diggin' lumps of gold.

O! I courted girls in Blarney,
In Kanturk and in Killarney
In Passage and in Queenstown, I mean the Cove (Cobh) of Cork.
But I'm tired of all this pleasure,
So now I'll take my leisure,
And the next time you will hear,
'Twill be a letter from New York.

(not in O'Lochlainn)
Goodbye to all the boys at home, I'm sailing far across the foam
To try to make me fortune in far America,
For there's s gold and money plenty for the poor and gentry
And when I come back again I never more will stray.


Can we find the source of that final "far across the foam" verse?
-Joe-