To be an Android Firefox user, you already went to the trouble of installing an alternative browser on Android. The motivations to switch browsers might as well be the same as those which will push you to switch search engines.
I would totally expect a reasonable number of Android Firefox users, of all apps, to change at least the search engine.
Chrome is embedded in Android way more than people realize. It's at a level of what IE was with windows, probably way worse too depending on how you look at it.
I would totally expect a reasonable number of Android Firefox users, of all apps, to change at least the search engine.
(I'm with you on the general case)