Amazon tracking widgets freeze mail functions on both Edge and Chrome.
Anytime that Yahoo Mail displays one of those Amazon tracking widgets, I can no longer do anything within Mail, like delete a message, on both Edge and Chrome. the page will just lock up and eventually chrome will throw a "Oh Snap" error with something like 'code_hung'
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If a page is slow or unresponsive you can try clearing the browser's cache and making sure it's up to date. Let us know if the problem persists at help.yahoo.com.