1.9.0 was released yesterday here on the site with the fix for the side-scrollers (and tons of other performance updates and bug fixes!)
It was submitted to the Chrome Extension store as well, but will probably take days if not more for them to release it. Until then, you can get it from our manual download & install page.
Otherwise, your extension should auto-update once Google Chrome Extensions Store releases it.
Check out the upcoming blog post for a rundown of all the upgrades in this release, it’s a good one!