You can test Electrolysis (e10s) in Firefox's Nightly channel. Use the File > New e10s Window command. Firefox can run e10s and non-e10s windows at the same time, so I use an e10s window by default and when I run into an e10s problem, I open a non-e10s window as a workaround. If you are using Linux or Windows, you may need to set the "layers.offmainthreadcomposition.enabled" about:config pref, but the "New e10s Window" command will open a dialog box to tell you if your computer needs this pref.

Since I believe I may have the project managers attention for a brief moment, I might be so bold as to ask a few questions :)

* In the e10s-addon-docs etherpad, it says that you expect a solid browser (ignoring addons) in Q2 and then with complete addon support in Q4. Is this still the plan?

* Will e10s include a task manager for e.g. identifying resource heavy tabs? I couldn't see anything about it in the GDoc backlog spreadsheet.

Thanks for your hard work on this project! I know many who are rooting for its success.

End of Q2 for a usable browser and end of Q4 for good addon support is still roughly correct. We are adding more Firefox engineers to e10s, so things are looking up. :)

The work to implement a tab task manager is tracked in https://bugzil.la/515352. This is a lower priority because it's not strictly necessary for basic sandbox functionality. Also, e10s currently runs all tabs in one sandbox process. This gets us sandbox security and jank-free UI without much memory overhead. We will eventually ship 1:1 or M:N tabs per sandbox processes.

I tried the e10s nightlies and it seems to be quite usable.

The major issues is some tab confusion (phantom, unclickable tabs), many "new tab" after session restore and occasional problems with context menus. I did use Tree style tabs and some other non-content related plugins and they mostly work.