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Select the link for the .mp3 that you wish to download so that it opens in a new tab.
- Long press on the bar in the centre of the screen with the play/pause control, time elapsed and volume control. Select Save Audio…and the file will download. (Tested it myself and it works.)
Well, if you actually open a file, any file, you can simply do File/Save as (Ctrl S) etc no matter what the format.
It gets trickier if it’s embedded in something or has embedded something instead of a simple file. Or if you open a stream. In many cases you can use the Page info and media tab to find a file for saving.
Edit: now I notice the post says Android. Still, features are probably same, but may be more hidden because of the limited UI.