The Matter web app is designed and tested for modern browsers. Inside Slack and Microsoft Teams, Matter runs in the Slack or Teams app itself, so this only applies to the web app at app.matterapp.com.
For everything on this topic, see the Workspace admin collection.
Supported browsers
The current version and one version back of each of these, on desktop and mobile:
Google Chrome
Apple Safari
Mozilla Firefox
Microsoft Edge
Internet Explorer is not supported.
Seeing a "Please update your browser" page?
Your browser is out of date or not on the list above. Update it, or switch to Chrome, Firefox, or Edge. If you still have trouble on a supported browser, email support@matterapp.com with your browser name and version.