Firefox Plugin: Session Saver

SessionSaver will auto-track and restore your browser exactly as you left it -- every startup, every time. Not even a crash can phase it: window-positions, tab-histories, cookies + scrolling -- all saved. It has a host of expert options, including session-storage, which allow a high degree of flexibility. Session-removal: right or shift-click in the menu. 'Expert' prefs: click "Simple" in the settings-panel

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