Ah, thanks for the hint. Poking around some more in firefox I turned off all of the add ons and it started started working correctly again.
Some binary on off and figure out it was Ghostery causing me a headache...
In the last week when I select new items to remove, but then click on something to look at it and then click back, all of my selected items are now unselected again?
Not sure if this is due to a firefox update for something else? Anyone else notice this? I find it mildly annoying...