Tab Scrolling feature is disabled by default and interested users need to manually activate and enable it by modifying a secret preference/flag.
Now the feature is available in public stable version of Chrome browser as well and anyone can use it. Recently the feature was under development and testing phase and was available in testing builds of Chrome (such as Canary). The good news is that Chrome team has implemented a similar Tab Scrolling or Scrollable Tabstrip feature in new versions of Chrome browser. Other browsers such as Mozilla Firefox handle this problem perfectly using Tab Scrolling mechanism.
This problem is known as Tab overloading or Tab overflow in Chrome browser and many users have complained about it in past.
If you need to open more tabs, the new tabs will not be visible on the tab bar as shown in following screenshot: When Chrome starts shrinking tab widths, first the tab titles are removed, then site favicons size is reduced and a time comes when you can’t see anything on tabs. In Google Chrome web browser, if you require to open lots of tabs, you’ll notice that as soon as you start opening new tabs, the width of all running tabs is automatically reduced by Chrome to fit all tabs on the tab bar or title bar.