Updated Inject JavaScript Code (markdown)

Inject-JavaScript-Code.md

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-Hello World!
+From version 0.4.1 you can inject custom JavaScript code into websites. This is great when you want to add custom functionality to each specific service.
+
+For example, some users want to make an Auto Refresh every X time because the service they are using, it's disconnect on inactivity. Here's an example to autorefresh every 10 minutes.
+
+```javascript
+setInterval(function(){location.reload();}, 600000);
+```