ExtJS is a JavaScript library for building rich internet applications. It's compatible with major browsers and is used to build rich, sustainable web applications quickly.

One of the good things about ExtJS is that it supports plugins. Another good thing is, ExtJS plugins don't need any installation. How could you use it s to include the plugin in your HTML code the same way as you include other JavaScripts, as the following example;

<script type="text/javascript" src="myextjsplugin.js"></script>

What's important is the loading sequence. Depending on your code and plugin, you might need to load the plugin before loading the core ExtJS libraries, but that depends.

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