Beats http://zzzscore.com/1to50/ in ~5 seconds. Can be made faster if your laptop isn't on it's last legs.

1to50beater.js

// http://zzzscore.com/1to50/ beater

function getPositions(root) {
  const elems = new Map();
  for (const elem of root.querySelectorAll('div')) {
    const num = parseInt(elem.innerText);
    if (num > 0) {  // Ignore spacer/styling elements
      elems.set(parseInt(elem.innerText), elem);
    }
  }
  return elems;
}

function tap(elem) {
  // document.createEvent('TouchEvent') doesn't seem to work, and this page uses jquery.tap(cb) anyway
  $(elem).trigger('tap');
}

function solve() {
  // This contains all elements 1-50, not just visible ones
  const grid = document.getElementById('grid');

  // Solve the next number
  // Solving is pretty fast. It crashed firefox so we'll have to slow it down
  function solveNext(grid, n, maxN) {
    console.log(`Tapping ${n}`);

    positions = getPositions(grid);
    tap(positions.get(n));

    if (n < maxN) {
      // Delay the next solve by 100ms - might not be necessary, but on my overburdened laptop this prevents
      // killing the browser. Possibly some unoptimised javascript animation going on when you tap a square.
      window.setTimeout(solveNext.bind(this, grid, n + 1, maxN), 100);
    }
  }

  solveNext(grid, 1, 50);
}

solve(); // suck it weller