Back Button URL Doesn't Shows Up

[Leinad4Mind]

When I use the extension with thanks for post MOD and when I give a Like or try to remove a like, it opens a new window saying that I've give a like or removed, and below that phrase we have "Back" text too that should had a URL to go back, but it just appears as text and not as link.

http://i.imgur.com/liUfCzd.png - here is an image so you can see the Back aka Voltar text that should be a Link.