If you use firefox as much as I do across a number of PC's and... own an ipad or iphone then you need the Firefox Home App

Firefox Home provides access to your Firefox desktop history, bookmarks and open tabs on your iPhone. Get up and go and have exactly what you are looking for on the Web on your iPhone or iPod Touch. Firefox Home uses your browser data, securely synced from Firefox on your desktop to the cloud, to let you search and browse quickly and efficiently. You can view the sites you want directly in Firefox Home, open them in Mobile Safari or share them with friends via email. Your Firefox data is private and only you have access to it.  Access it here.