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    Extremely excited about this. Does anyone know more about this part?

    Even when Electrolysis is finally released into the wild, though, Mozilla will be exceedingly cautious with the ramp-up. At first, e10s will only be enabled for a small portion of Firefox’s 500 million-odd users, just to make sure that everything is working as intended.

    Will there be an about:config setting for the rest of us to use if we want e10s?

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      Yeah there is a config for it, you can actually do it right now if you want. At first, only users who have no extensions installed will have it enabled by default. If you do have extensions installed and want to try e10s anyway, check this page out to see if they are all compatible. If you see “shimmed” it means the extension should work, but will likely slow things down a lot.

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        When you say “will likely slow things down a lot”, are you comparing against the current baseline single-processor experience, or against the improved performance of e10s?

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          It will be slower than baseline/non-e10s performance. Traditionally, addons in the privileged chrome context could synchronously access JS objects/methods/whatever in content. Those two contexts are now in different processes, so shimming the access patterns some addons used involves blocking on IPC calls.