I use this one on my phone to boost text size when my eyes are tired

javascript:var%20p=document.getElementsByTagName('*');for(i=0;i%3Cp.length;i++)%7Bif(p%5Bi%5D.style.fontSize)%7Bvar%20s=parseInt(p%5Bi%5D.style.fontSize.replace(%22px%22,%22%22));%7Delse%7Bvar%20s=12;%7Ds+=8;p%5Bi%5D.style.fontSize=s+%22px%22%7D