Thanks for the review. Sadly the addon is not working right now on mobile (it has some issues with the API from mobile and I couldn't get it to work a while back - I should try again maybe I can make it work now). There should be no way to install it on Firefox mobile and I really have no idea how you managed to install it that because it's not supported and there's no official version for mobile so this is quite strange that you managed to do that.
Of course everything you saved into bookmarks you can access them on the mobile device (as long as you have configured Firefox Sync account to sync bookmarks).. It's not perfect but at least if you really need access to the saved session you can open them.