Gmail is great, and so are its labs features that would come handy for most of the Gmail users. To enable a particular lab feature in Gmail, users just had to go to the “Labs” tab under the settings page and choose the required lab feature from the list. But over the time, what happened was a huge in the number of such labs features added to the Gmail. As such now there are more than 50 labs features available under Gmail Labs section. Finding and selecting the item needed from them is just getting troublesome for few users like. Agree that there is always the built-in search feature (using CTRL + F) feature available in all the browsers to narrow down your search, it would have been better had Google, the giant search engine had added a small search engine to their Labs section to avoid scrolling. Gmail engineers have now responded quick enough to add not just a search feature but with Google Instant-like “search-as-you-type” feature.
If you haven’t really figured it out, go try it and enable this Google HD Video chat option from the Gmail Labs.