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Deferring parsing of JavaScript is one of those messages that you get on sites like GTmetrix and other page speed sites that may sound like it’s from another planet. What on Earth does defer parsing of JavaScript even mean? Basically, what the message is saying is that a browser needs to process all of the content inside tags before it can load the page. By putting off the processing of JavaScript until it is actually needed, you can reduce the initial load time of your page.

There are a few reasons why we should defer parsing of JavaScript in WordPress. The most important one is speed and performance. Generally, JavaScript is placed between the head tags. When opening a website, it loads the code from top to bottom. This means that if you have lots of JS or long strings, it will take more time for the website’s content to appear, as it first waits for all the JavaScript to load.

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Here we will see How to remove hide the select arrow in Firefox using -moz-appearance:none;

Set -prefix-appearance to none to remove the styles;
Use text-indent to "push" the content a bit to the right;
Finally, set text-overflow to an empty string. Everything that extends beyond it's width will become...

The CSS will be :

select {
-moz-appearance: none;
text-indent: 0.01px;
text-overflow: '';

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