NextGen Gallery Causes Link icon to ghost out in Firefox

The latest NextGen Gallery breaks the link button in the WordPress Visual Editor causing it to be greyed out. I am using WordPress 3.6 and NextGen Gallery 2.0.7.

See here –> https://www.ads-software.com/support/topic/hyperlink-button-grayed-out-not-working

Yup, this is a known issue that affects some segment of users, but we haven’t diagnosed the cause. There are some quick fixes (sort of) in the thread that @w.bear links to. We’re working on this one now.