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Firefox ui crashes after uploading file in my web application

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Getting error as " A webpage is slowing down your browser.what would you like to do?"

Please do the needful for my issue

Getting error as " A webpage is slowing down your browser.what would you like to do?" Please do the needful for my issue

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”Webpage is slowing down your browser” This is the new way the browser tells you there is a problem with the script program(s). https://support.mozilla.org/en-US/kb/warning-unresponsive-script?cache=no

https://support.mozilla.org/en-US/kb/task-manager-tabs-or-extensions-are-slowing-firefox

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Are you uploading via the "Browse" button feature like this forum uses to attach a screenshot or is this done otherwise ?

It is possible that (anti-virus) security software is causing the problem.
Try to disable security software temporarily to see if that makes a difference.