This may be of interest to you: Is it safe to install a "companion app" with a Firefox extension? - #21 by exaCORE
Basically, choose reputable and open source and actively maintained applications. Make sure to research apps before you download. F-droid can also be a good resource to find new apps, but always do your research.
DivestOS also has a list of recommended apps you could look at: Recommended Apps - DivestOS Mobile