Is this possible? (Xperia Z3c & older firmware)

Phone: Sony Xperia Z3compact
Model: D5803
Android Version: 5.1.1

Love my Z3c, but one major problem haunts my mobile existence. Due to poor eyesight I require 'reflow-on-pinch-zoom' to be present in my firefox mobile browser.

This stopped at version 24 of FF Mobile, due to Google changing how Webview/Android 4.4 KitKat worked.
v23 of FF Mobile now just says it has crashed when you try to open it.

Is it possible for me to flash my X Z3C with older firmware to force it to be compatible with the old way reflow-on-pinch-zoom? Am I correct in thining that if it is possible, I need to be looking at flashing my Z3C with Android 4.3 OS or am I safer going with Android 4.2?

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