I have tried to switch back to ff from chrome several times now (first try was when developer edition came out, second try was when multi-tasking came out) but failed, because ff has been too slow in comparison.
Downloading the new developer edition now... Hope it can stay on my dock this time!
I had tried spacemacs for a few months, it was nice overall, but everything seemed to be a little bit slower there than in vim, so I eventually switched back to vim.
This only makes sense if you're on servers all the time, otherwise I wouldn't refuse to have a better workflow because of short period of inconvenience/annoyance.