Hello shihadi, this option is there both for mozilla android and desktop,slide your notification bar to see download status. Thanks.

Try this out,if not report here.

Thanks for your kindness to help me, but I already know about that, what I ask is the estimated time to completed the download ( that what I said progress). Ex; if after 5 minutes i' m download there have 25% then estimated time remaining maybe 15 minutes again. While at mozilla in your pc they provide it, is at mozilla android too?

This is not a feature of Firefox for Android.