Enlarges only the Arabic text on the pages you visit and shows it in a clear typeface. Everything else stays the same.
See the tool →Browser extensions · free
Free tools
Small extensions to read and type Arabic on any website. Free, no account and no ads.
Get it for Chrome 
Get it for Edge 
Get it for Firefox 
Opens an Arabic keyboard right under the box you are typing in, and what you press goes straight into that box.
See the tool →Made by Arabooki and the Escuela Internacional de Árabe.