Combined with tree style tabs this is very useful. Tree style tabs provide organisation nearly without you having to do anything special. But sometimes for a

Combined with tree style tabs this is very useful. Tree style tabs provide organisation nearly without you having to do anything special. But sometimes for a deep dive shopping session or researching something across many sites, I open a new window. I don't keep them around though, I like my Emacs window and my Firefox one be one alt tab apart most of the time. I'm so used to it in fact that when there's a third window I feel partially impaired. Also, when sth is in an other window that I don't frequent (say in a different workspace) I tend to forget about it. I restart my computer and my two pillar apps infrequently, so it's possible that such windows remain unseen for weeks. But tree style tabs combined with vimium-ff allows me to use a single window most of the time, except temporary tasks that will require me to open and close numerous tabs in a short period of time.