ERR_BLOCKED_BY_CLIENT means something on your browser is stopping a webpage or...

https://sierra-wiki.win/index.php/Why_Does_My_Content_Blocker_Break_Checkout_Pages%3F

ERR_BLOCKED_BY_CLIENT means something on your browser is stopping a webpage or resource from loading. To fix it, try opening the page in private mode. If that works, check your browser extensions and disable any that might be blocking content