If you want protected tab to be preserved among sessions, please install newer version and check "save session when protected tab exists" option. https://addons.mozilla.org/en-US/firefox/addons/versions/12536
I used this add on on my fast dial page. It did the job of protecting the fast dial page but any links clicked on the fast dial page would open 2 tabs of the same page, like its duplicating every link once.
Does not remember locked tabs between sessions. Permatab would remember tabs and reopen them when starting FF, this needs that option. Also when using Google reader clicking on the side links open a new tab instead of using the same tab.