Link Vault is a WordPress plugin that adds a widget to your post editor allowing you to easily drag and drop commonly used hyperlinks.
This plugin was written by the employees of Orangecast Social Media who owns HostCo. HostCo is our premium WordPress hosting platform. Link Vault's official home page is on the HostCo website. Call it home, call it advertising, it is a free plugin.
We've seen this in versions of Firefox and continue to investigate it. We suggest using the right click and manual, right-click hyperlink method with Firefox to create hyperlinks.
Nope! In fact, IE8 disallows drag and drop so you'll be limited to the right click link creation method. See our screencast for more information at http://wphost.co/plugins/link-vault