This extension will put a double purple border around all links that will open in a new tab (i.e. links with target="_blank").
There are two main purposes for this extension:
1. If you build or manage websites, this is a great way to check that _blank is or is not being used on various links.
2. Sometimes _blank links are hiding amongst normal links. With the _blank extension you'll have a heads up before clicking a link that will pop open a new tab/window.
Feel free to fork/contribute: https://github.com/bzle/_blank
This is designed to be a compliment to igorware.com's NoFollow extension, which puts a red dotted outline around nofollow links. (https://chrome.google.com/webstore/detail/nofollow/dfogidghaigoomjdeacndafapdijmiid)