Firefox add-on to preloads neighboring tabs of the currently active tab if they are pending to be reloaded after a restart of Firefox. These tabs are preloaded in the background.
The numbers of tabs to be preloaded left and/or right of the active tab can be selected in the add-on preferences.
The add-on is can be downloaded from AMO: https://addons.mozilla.org/firefox/addon/tabpreloader/