I've been avoiding updating to FF18 because I'm so used to using PermaTabs, in particular being able to go back easily to the main URL for a particular permatab eg the home page of the NYT or WSJ after reading an article. There doesn't seem to be a way to do this with pinned tabs. What if anything am I missing?
Second, no, there is no way to go to the original tab with the click of a button, but you can use the back button to do the same thing. Also, it looks like permatab was abandoned by it's dev a very long time ago, try looking for a replacement addon