Regular Linux running KDE (e.g. Kubuntu) is vastly superior to those streaming TV devices that run Android.
Just get a wireless keyboard and a regular wireless mouse. You won't be disappointed.
KDE lets you increase the default zoom level for all applications to something like 225% without fucking everything up.
You'll still need to go into your Firefox settings to increase the zoom level there, but those two places cover 99.999% of all streaming use cases.