Binabik: Sorry i did not reply yesterday (Birthday drink and everything lol).
Did you try Exporting your Bookmarks to your Desktop and importing from there ? If it is speed you are looking for Mozilla do a Application (that is also a Firefox Add-on as well) called Prism. It is faster than any browser as it runs a website as an application as such (for want of complicated terms lol). You get nothing else apart from the webpage, no Add-ons, no forward/backwards, Bookmark buttons etc..etc....
If you fancy using it, i would suggest downloading the Add-on version into Firefox. Once installed, just click Tools on any website you use (or spend a lot of time at) and in the pop-up menu you select 'Convert website to application'. Give it a name when the page pops up, and it will create a Icon on your desktop.............. instant speed lol
All this said, try to get the Bookmarks sorted as well lol
(Cacher) Vous êtes d'humeur de jouer une partie rapide qui est garantie d'être finie dans les 2 heures? Créez une nouvelle partie de votre choix, choisissez le Temps pour la partie et réglez le Temps à 0 jour/1 heure, Incrément à 0 jour/ 0heure et la Limite à 0 jour/ 1 heure. (TeamBundy) (Montrer toutes les astuces)