Mac users of Google Chrome, here is a good news for you. You can now use extensions on Google Chrome beta without having to use a hack. The extension and bookmark sync from the dev channel of Mac, has now been ported to the beta channel.
This would suggest that support for extensions and bookmark syncing will be available in the stable version of Chrome for Mac in the next few weeks.
Using bookmark sync you can synchronize your bookmarks across platforms including on Windows, Linux and Mac. So if you are not afraid of using beta software, go ahead and download Google Chrome Beta for Mac. You can also watch a video of the new beta in action on a Mac in the meantime.