Hello all, We’ve identified an issue with our loader’s handling of a new user agent string that some browsers use to identify macOS Big Sur. The impact is that Unity WebGL games will fail to run on Chrome or Edge for macOS users running Big Sur. To address this issue, we have made the following bug fix to the Unity loader.js. https://issuetracker.unity3d.com/issues/unity-webgl-builds-do-not-run-on-macos-big-sur This fix requires developers to upgrade their Unity Editor and rebuild their WebGL projects. We have addressed this issue in the following Unity releases: 2018.4.31f1, 2019.4.16f1, 2020.1.15f1, 2020.2.0f1, and Unity 2021.1.0a2 and above. We are also looking into what we can do for developers that cannot rebuild their existing games, and will provide additional updates here and on the issue tracker when more information becomes available. Please let us know if you have any questions!