Google today announced the beta version of Google Chrome for Mac and Linux along with the launch of Google Chrome Extensions gallery. However, unlike Linux and Windows version of Chrome, the Mac version does not have support for Chrome extensions yet.
Thankfully TechCrunch discovered a hack which will allow users to install Chrome extensions on the Mac Version of Chrome.
For complete instructions, visit this page and drag the bookmarklet to your bookmark bar. Whenever you visit an extension page, click on the bookmarklet to enable the Install extensionbutton.
Note: You need to use the development version of Chromium on Mac for this to work.