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It is the web page doing this, so if you have control over the web page then modify its content. You can use a autoconfig.cfg file to force the pref to false for all users if this is about Firefox in a company environment.
Try to ask advice at the Stack Overflow or Reddit forum website.
As an app developer I need to disable this notification popup for all users at once.
I'm puzzled by that statement. If you are the web app developer, and you don't want to hook the beforeunload event, and you don't know why it is happening, that's concerning. Are you using frameworks or libraries that might not want a user to leave the page to avoid loss of unsaved data while editing or progressing through a transaction? It's got to be somewhere.