No, he shouldn't have to learn to use them. When open source fails this type of thinking is often why. Firefox makes a product and therefore should improve that product so that more people want to use it.

Vendors in a market are rarely in a position to tell the customers in that market what they should and shouldn't do. We don't want them to be in that position either, even Mozilla. They have to improve their offering.

I for one also think that Chrome's dev tools are better and am 100% in the camp of wanting to see Firefox gain market share.