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Can't use Firebug/FirePHP to debug AJAX calls any more; how do I view PHP variables in Firefox DevTools?

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I've been developing AJAX apps and using Firebug/FirePHP to view server-side PHP variables. Since F/F is no longer viable with PHP 8.0, how do I now view variables in Firefox Developer Edition DevTools? Thanks.

I've been developing AJAX apps and using Firebug/FirePHP to view server-side PHP variables. Since F/F is no longer viable with PHP 8.0, how do I now view variables in Firefox Developer Edition DevTools? Thanks.

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Try to ask advice on a web development oriented forum.