your motivation to switch to Firefox was based on your willingness to support them over Chrome. The other poster is saying maybe you switched to Firefox from Chrome (presumably, you don't say if you were primarily Chrome prior) due to a preference for supporting Mozilla over Google, but how many users are going to be motivated by that to move the needle?

If you were using Chrome before, Mozilla was around before and their motivations were the same: why did you switch to Chrome in the first place? I'd imagine the motivations there are the ones that are most common (after all, Google ended up eating Firefox's and IE's lunch somehow).