I wish Mozilla would give some kind of guarantee that they won't drop the feature, otherwise I don't feel like investing time into building a workflow around it is worthwhile. And it's sad that this is even an issue.
Sure, that makes sense for your business, because it saved money. For me, personally, I don't want spend time getting used to software that is likely to be taken away from me (i.e. forced obsolescence). That is a very frustrating experience. I'd rather use and build on software that I know is going to remain usable for a long time.
You could look at it as silly, but in those 6 months it saved around 700 work hours after it had paid for its dev time.