Add extension to the docs

Author: adriaandotcom

_docs/30_features/40-extension.md

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+---
+title: Block your visits extension
+category: features
+category_order: 3
+order: 6
+permalink: /extension
+---
+
+If you are a customer of Simple Analytics and you want to block your own visits this extension if for you. With it enabled your stats will not include your visits.
+
+> Download the extension [for Google Chrome here](https://chrome.google.com/webstore/detail/simple-analytics/ehkndchainpkdfpnancgobgfnfjnmmeh)
+
+We do this via an extension so we don't need to record IP addresses. It basically blocks requests on websites where you give permission for.
+
+<img class="border" style="width: 100%;" src="/images/extension-chrome-closeup.jpg" alt="">
+
+When you click on the icon you as asked to allow the extension to load the data from the current website. This is needed to block the visits. You need to do once this per website.
+
+When a visits is blocked it shows up as a counter on the icon. The counter does reset when you close your tab. For more stats of blocked visits you can go to the options page.
+
+<img class="border" style="width: 100%;" src="/images/extension-chrome-options.jpg" alt="">
+
+On the options page you will find all websites being blocked and you can change what the extension should block.
+
+Enjoy and if you have any feedback, go to our website and let us know!
+
+> For now the extension is only available in Chrome