SessionSaver restores your browser -exactly- as you left it, every startup, every time. Not even a crash will phase it. Windows, tabs, even things you were typing -- they're all saved. Use the menu to add + remove sessions; right, shift, or middle-clicking will delete. "Simple mode" for peace of mind, or "Expert mode" for advanced flexibility.
Also has TextSaver: everything you type, saved (even in frames). Added RemoteSync: session-syncing between browsers (syncs Adblock, too). Added intelligent postData-restore. Added various patches + bugfixes, per discussion in the official support thread.
Download:
https://addons.mozilla.org/extension...firefox&id=436
More info:
http://kb.mozillazine.org/SessionSaver