Galaxy 7 use issue on Firefox

When typing in the reply block within a forum thread, on my phone, the font defaults to very small, smaller than the regular font on the thread. Sometimes, I hit something on the screen and the font within the reply block gets larger, much larger..
I have not been able to replicate it.
I am on my laptop now..
Easy to read obviously.
But on the phone, I have to manually use two fingers and move out the box to zoom in..to see what I am typing.
I use a Galaxy S7, Mozilla Firefox as a browser

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