Hi, From Android settings > Apps, you should make Firefox the (default) browser app. I'd also recommend going to YouTube app's settings and disabling its links so they open in FF instead. However, I don't know another way for Google apps than completely disabling Chrome (again, from its app settings). This seems to open those pages in FF instead. The phone warns of possible adverse consequences if you disable it, though, and I haven't spent any time testing that yet. I'd also like to know if this can be done without the drastic measure of disabling Chrome outright.