Follow the steps given below....
  • Go to Blogger- Template- Edit HTML.
  • Click on Proceed.
  • Now search for <head> (Use "Ctrl+f" to search).
  • Just below  <head>  add the below code.
<base target='_blank'/>

  • Click on Save Template and you are done.
  • Now visit your blog and click on any link. You will see that the link will open in a new tab.
  • Screen Shot given below
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