so I just used a browser on someone else's phone
and now the half of my brain that's constantly going on about "stop changing the UI all the time!" is getting in a fight with the half of my brain that's like "ok but! putting the URL bar on the bottom edge of the screen is an absolutely 10/10 brilliant workaround for the problem of phone designers making them bigger and bigger every year so your thumb can't reach the top any more"
sorry I doubted you Mobile Firefox; you were right all along