Update Readme.md

Author: garethx

packages/chrome-extension/Readme.md

@@ -2,22 +2,8 @@
 
 ![Image](https://github.com/codesandbox/codesandbox-client/blob/master/packages/chrome-extension/assets/still2.png)
 
-[![available in the chrome store](https://developer.chrome.com/webstore/images/ChromeWebStore_Badge_v2_206x58.png)](https://chrome.google.com/webstore/detail/jkhbnhagngalpojoeijaleemepfpefmp)
-[Download for firefox](https://addons.mozilla.org/en-US/firefox/addon/open-in-codesandbox/)
+[![Available in the chrome store](https://developer.chrome.com/webstore/images/ChromeWebStore_Badge_v2_206x58.png)](https://chrome.google.com/webstore/detail/open-in-codesandbox/hdidglkcgdolpoijdckmafdnddjoglia)
+[![Download for firefox](https://discourse-prod-uploads-81679984178418.s3.dualstack.us-west-2.amazonaws.com/original/3X/c/0/c03e12b8fae82e431eabaf0f6e250bfc78504182.png)](https://addons.mozilla.org/en-GB/firefox/addon/codesandbox/)
 
 This extension adds a button to all GitHub repos that will open that repo in
 CodeSandbox in a new window.
-
-## How to run in Chrome
-
-- Open the Extension Management page by navigating to chrome://extensions.
-- Enable Developer Mode by clicking the toggle switch next to Developer mode.
-- Click the LOAD UNPACKED button and select this folder.
-
-![load](https://developer.chrome.com/static/images/get_started/load_extension.png)
-
-## How to run in Firefox
-
-- Open about:debugging
-- Click "Load Temporary Add-on"
-- Open the extension's directory and select any file inside the extension.