Dipak C. Gajjar

WordPress comments are very important for a blog and really makes it possible to interact with users. Comments are why users take more interest in a blog.
But one of the problems with the comments is that all the links (URLs) in the comments open in the same window. This diverts the user’s mind away from the actual post and increases the bounce rate.
This plugin opens all the links added in the comments and author URL, in a new tab or window which helps to decrease the bounce rate and increase user engagement on your blog.
Follow the development of this plugin on <a href="https://github.com/dipakcg/wp-open-comment-links-in-new-window" rel="nofollow ugc">GitHub</a>
P.S. It is always the best policy to open a <a href="https://wordpress.org/support/plugin/wp-open-comment-links-in-new-window" rel="ugc">support thread</a> first before posting any negative review.

WP Open Comment Links in New Window

Opens all the links (URLs) added in the comments and author URL, in a new tab or window.

Erin McIntyre

This plugin searches links on your site for the domain that you specify in the settings, adds your affiliate ID, and makes those links open in a new tab when clicked.
The plugin produces XHTML Strict compliant code and is search engine optimized (SEO). 
This is done using JavaScript’s <code>window.open()</code>-function. It adds only a few lines of vanilla JavaScript to the page, and does not require any external libraries like jQuery.
Most other plugins perform a hack by altering the <code>target</code> parameter (i.e. <code><a href="http://somewhere.example" target="_blank"></code>). That method is not XHTML Strict compliant.
This plugin handles the links client-side, which lets search engines follow the links properly. Also, if a browser does not support JavaScript, the plugin is simply inactive, and does not result in any errors.
Credits 
Inspired by the <a href="https://wordpress.org/plugins/open-external-links-in-a-new-window/" rel="ugc">External Links in New Window / New Tab</a> plugin.
Known bugs 
The plugin conflicts with other plugins that change the links’ `onClick´ attribute.

WP Open Comment Links in New Window vs Affiliatize Me