To use Shopify, you need to use the latest web browser. If you do not use the latest version of your browser, you may not access to the admin or use the full functions. For optimal usability, please use the latest version of Google Chrome to access Shopify. ( information from Shopify Help Center)
If you are experiencing errors in your browser, please ensure that third-party cookies are allowed in your privacy and security settings in Google Settings. After adjusting these settings, clear your cache and restart your browser.