Multi tab Widget is a great space efficient widget for Blogger. It helps to decrease the load time of your Blogger blog by combining three or more than three widgets into one. The tabbed navigation widget features tabs and a content window; when clicking on the tabs, different content is visible in the window beneath. You can use it for Popular posts, Top commenters, Recent Posts, Recent Posts or any widget as you like.
Login to your Blogger account and navigate to, Template >> Edit HTML, hit Proceed and check Expand Widget Templates.
Find (CTRL+F) this in the code:
and paste the following piece of code just before/above it
Now copy and paste the code below:
Replace these with your tab titles
Replace these with your widget codes.
Tab 1 content goes here,
Tab 2 content goes here,
Tab 3 content goes here
Preview and save the template.