pkg delete of firefox fails: firefox-51.0.1_1,1 is locked and may not be modified

[Bob Willcox]

I'm trying to update firefox on my system but can't update it or even delete
it. I get this result on pkg delete (for example):

root at tavion:1 /usr/ports/www/firefox> pkg delete firefox

firefox-51.0.1_1,1 is locked and may not be modified
Checking integrity... done (0 conflicting)
Package(s) not found!

Now, I suspect that I am the one responsible for 'locking' it a few months
back when I didn't want to inavertantly update it. Unfortunately I can't
recall what I might have done to lock it (memory isn't what it used to be).

Can someone shed some light on where/what this lock may be?

Thanks,
Bob

-- 
Bob Willcox    | Lawsuit, n.: A machine which you go into as a pig and
bob at immure.com |    come out as a sausage.
Austin, TX     |    -- Ambrose Bierce