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You should came across Youtube video results that’s appeared in the Google Search page when you are doing some googling. Google search results first include links to content that’s hosted on Youtube two years before. To be able to watch the Youtube videos, you will need to click on Youtube thumbnails or the links. Well, here’s a quicker way to play Youtube videos.
GoogleTube is a Firefox add-on that allows you to play and even download Youtube videos directly from the Google Search result page. This useful Firefox extension adds Youtube icons next to Google search result. You just need to click on the Youtube icon next to the search result to instantly watch the video without having to open any other tabs or windows. You can also download the video and view more information regarding the video (date added, views, rating, comments) directly from the search results. 
Now, let’s experience Youtube videos in the Google Search page.
Nice, i always use http://www.download-youtube.com/ to download but i’ll try this