I've been using this for a few months now and I love it. Along side temporary containers[1] and tridactyl[2] which gives
- auto containerization based on url match
- keyboard driven way to open new pages in a specific container
FF transforms into a powerful browser OS running applications with hard boundaries.
The only UX issue (which admittedly could be because I have changed the theme to be minimal by hacking userChrome) is that sometimes the temporary containers I spawn are the ones I need to retain (user storage) etc and I tend to forget that and loose data.
[1]: https://addons.mozilla.org/en-US/firefox/addon/temporary-con...