Here are some super useful Chrome extensions for developing in Google Apps Script:

Google Apps Script GitHub Assistant (Ability to branch, pull, push, and diff from IDE): https://chrome.google.com/webstore/detail/google-apps-script-github/lfjcgcmkmjjlieihflfhjopckgpelofo

Apps Script Color (Dark theme for the IDE): https://chrome.google.com/webstore/detail/appsscript-color/ciggahcpieccaejjdpkllokejakhkome