Hi, I assume that this is in reference to Facebook. Firefox and Facebook are two different things. Facebook is a website, and Firefox is a web browser which is used to view load and view websites.

For questions about how to use Facebook, I would suggest visiting the Facebook Help Center - https://www.facebook.com/help/

Thanks for the reply. I was getting it mixed up, I guess. I did go to Facebook Help and found that always defaults to Top Posts; at the moment, you can't change the default. I uploaded a suggestion that they let us have a choice. — We'll see…

Actually this is a problem with Firefox on Android. Other mobile browsers have the "Most Recent" option in settings but it doesn't show up for Firefox.

I prefer using the Firefox browser vs the Facebook app (or another browser) for privacy so this is an important issue for me.