Google Browser Sync for Firefox lets you keep track of the tabs you are using on any of your computers. Install the extension on all copies of Firefox that you use, and each time you start up a browser anywhere you will see your history and have the ability to select which tabs you want to view from any of your other locations.
Google Browser Sync
Other recommended Firefox extensions
UPDATE: My experience with this extension has been poor. Opening the tabs from one browser closes tabs from the other, and it doesn't protect against crashes as well as other Firefox extensions do. For the time being, I've turned off the Browser Sync.
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