“… Chrome extensions do not work on Google Chrome installed on the computer”. This is likely to happen if you have installed stable Chrome release and not beta release. But from now on, you can use Chrome extension in latest stable release of Google Chrome browser (no need to install beta Chrome to use Chrome extensions).
To get started, existing Chrome users can install updates to upgrade Chrome browser to new version with extension support. New users can goto: google.com/chrome to download and install latest Google Chrome browser.
Using Google Chrome extensions
To use Chrome extension, goto Chrome extension gallery and click to install any extension of your choice. Also, you can uninstall or remove any Chrome extension or add others as per requirement for cool & customized Chrome browser on computer, what say?