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How to make it easier to use your phone one-handed
You don’t need to use two hands to work your phone.
Android has a dedicated one-handed mode that lets you shrink any app down to the bottom half of the screen to make it easier to reach. You can find the same option inside Firefox for Android: tap the three dots (top right), then Settings > Customize and choose Bottom for the toolbar. Long -press on the icon in the lower left corner (it’ll show a globe or emoji symbol, depending on the keyboards you’ve got installed).
Or read this on The Verge