Quick Reblog for Tumblr makes it easy to reblog from the Tumblr Dashboard. Just click on the "Sharing Menu" (...) and choose your blog - and the post will get reblogged in the background.
On the options page you can set up Quick Reblog for Tumblr. When you add the extension to Google Chrome, the option page will open and we'll guide you through the process.
This Chrome Extension use the Tumblr API. Using the Tumblr API it's possible for us to make it easy for you to reblog posts from the Tumblr Dashboard.