An extension for Turtletoy.net that allows more leniency to turtle rendering times (disables timeout).
Download the code as a zip and extract it somewhere on your harddisk. Remember the directory you extracted.
Then, please follow the instructions on https://developer.chrome.com/docs/extensions/get-started/tutorial/hello-world, specifically the section on 'Load an unpacked extension'. Optionally 'Pin the extension'.
You're all set.