This page allows you to do a quick check whether your browser supports the JavaScript features that OctoPrint uses.
Feature Required since Supported?
ES5
general ES5 support
ES6
arrow functions 1.9.0
const 1.9.0
generators 1.9.0
let 1.9.0
template literals 1.9.0
ES8
async/await 1.9.0
ES9
async generators 1.9.0
spread syntax 1.9.0
If any of the tests above say "No", you will need to use a different browser or update your current browser to a newer version before you can use OctoPrint.