Undo Closed Tab/Restore Last Session

Hello there. There seems to be a problem with the "Undo Closed Tab". The feature is active ( button is not faded out/grey ) , but after pressing it , nothing happens. This came to being when Aurora was updated to v29. The daily updates ( well , not so daily ) , does not seem to fix this problem , and there is nothing on the internet that helps. I tried resetting all values in "browser.sessionstore.*" , but nothing happened. There is also another problem : i can't seem to find the "Restore last session" button on startup screen. I didn't find it in the Library ( CTRL-Shift-H ). Any ideas ?

The "old" home page was about:home (you can open about:about to see more about: pages).
Can you confirm that sessionstore.js is being created and updated as you browse?
You can open your current Firefox settings (AKA Firefox profile) folder using
Help > Troubleshooting Information > "Show Folder" button
If you find one or more files named sessionstore but not sessionstore.js, Windows may be hiding file extensions from you. To work with files as accurately as possible, I suggest unhiding them. This Microsoft support article has the steps: [http://support.microsoft.com/kb/865219].

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