Text reformatting in the current version of Firefox works only when you double-tap to zoom, not when you pinch to zoom. (We're hoping to improve this in a future version of Firefox.) For more instructions, see [[How do I zoom in and out of a website?]] You can use the options from the [https://addons.mozilla.org/mobile/addon/bigger-text/ Bigger Text add-on] for some additional control over text formatting.