Convert Photoshop Brushes to Images for MedibangI thought this may be useful for some people. XD Anyway, so Medibang nor FireAlpaca support .abr brushes, but it is possible to extract the images from them using ABR viewers.
For Windows: abrViewer.NET || abrMate (Click on the picture that looks like this: ...or click here. )
For Mac (and probably Linux): abrView (Click on the blue dot on the calendar. ...or click here. )
Since I am on a Mac, I can only explain how to find the pictures on a Mac, but I don't think the Windows programs should be too confusing. You can probably google the program