Update README.md

README.md

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-# Simple-New-Tab
-A Firefox extension for a minimalistic new tab page.<br>
-Thats all.
+<h1 align="center">Simple-New-Tab</h1>
+<p align="center">A Firefox extension for a minimalistic new tab page. Thats all.</p>
+
 ![image](https://user-images.githubusercontent.com/61917048/133905721-b16cd510-89d0-4a4c-95dd-bf5a5b94d9aa.png)
+</p>
+
+<h2>Building</h2>
+Just zip the source code.
+
+<h2>Installation</h2>
+
+<b>Note that you must be using either [Firefox Nightly](https://www.mozilla.org/en-US/firefox/channel/desktop/#nightly) or [Firefox Developer Edition](https://www.mozilla.org/en-US/firefox/developer/). Unsigned extensions do not work with regular Firefox.</b>
+
+To install the extension, drop either your own build of the source code or a zip from the [releases section](https://github.com/ThatCrispyToast/Simple-New-Tab/releases) onto the extensions list at [about:addons](about:addons).
+
+![Gif of User Dropping ZIP onto addons Page](https://media4.giphy.com/media/9DebsQlodranIJ2kHG/giphy.gif?cid=790b761105cb79f1e7a23d79a57735ff6afca280dc09ccdf&rid=giphy.gif)