It seems Mozilla has removed the SSB option from firefox. I used that all the time and without it, I have had to revert to using chrome, which I don't want to do. Wny remove a feature? Its buggy? So what. A buggy hidden beta feature is better than no feature at all. It has users, including me. So just leave it as unsupported. Don't just axe it. As to it having "no benefit". Absolutely the opposite - in a world where every app is now a cloud web app, we need to be able to separate different apps within windows, not just have multiple indistinguishable windows or tabs for each of the apps. So yes this was a seriously retrograde decision, and one which is sending firefox in a backward direction. SSB was the future. It's just few people were aware. So when are mozilla going to reverse this decision? Does anyone know any other clever way to achieve the same thing - i.e. a separate fixed app for each webpage.