Back and forward buttons not working on FireFox

Since a couple of days the back and forward arrows of the FF menu stopped working on the Manjaro forum. It's an issue I don't have with other discourse forums or on other browsers (chromium). So I think it's 'Manjaro' related.
Hopefully there is an easy fix as is it's not possible to navigate properly anymore on the forum (for me only?).

Ah, I'm so stupid.
After writing about the issue, I got an idea and I removed the ~/.cache/mozilla folder and gave it another shot and it's working again.

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