ప్రత్యుత్తరాలన్నీ (1)
cutipynlb said
how to make Firefox default browser on a android
https://support.mozilla.org/en-US/kb/make-firefox-default-browser-android
However if you are referring to search engines then see https://support.mozilla.org/en-US/kb/manage-my-default-search-engines-firefox-android
You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.