Why aren't Waterfox or LibreWolf found in F-Droid?

Are there any alternative app stores that do list them? I might just go to apkpure to side load, but it's annoying these often-recommended browsers aren't available there.

Alternatively, are there any browsers preexisting in F-Droid any of you recommend?

Just got a phone and just installed lineage OS.

Edit: FOUND IT in case anyone is looking https://github.com/BrowserWorks/waterfox-android/releases list of APKs here