The Firefox for Android GitHub releases aren’t being updated anymore, and is versions behind the Play Store now.
FDroid Fennec isn’t fully the same app, and FDroid has it’s own set of delays.
Is there a location where the latest version can be pulled/tracked with Obtainium?
Not really. Safest place to get an app is from the Dev if you’re not using the play store. FDroid has been known to host out of date packages forever, causing security concerns.
Obtainium is pretty easy to use.
Obtainium fucking rules
The Play Store is pretty good with keeping things up to date.