How to back-up firefox data on android without using firefox?

[radsci]

Recurrent crashes, need to back-up firefox data before reinstalling, want to access files from backup, delete others, then restore.

How can this be done on a non-rooted phone?

NB: always crashes before anything can be done via menu.

[radsci]

Per a comment, this:

Firefox Quantum for Android - backup profile without root?

no longer works

[terajane]

Thanks for the information and it works for my firefox android.