PSA: e10s will soon remain active in safe mode

Mike Conley mconley at mozilla.com
Wed Jun 10 15:30:49 UTC 2015


Hello all,

When somebody reports a problem with e10s[1] that we've not seen before,
we often ask the user to disable their add-ons to see if the problem
goes away. This is because there are still quite a number of
e10s-incompatible add-ons out there, and they might be reacting in very
strange ways.

Unfortunately, the easiest way to disable the add-ons (safe mode, via
Help > Restart with Add-ons Disabled) also happens to disable e10s.

This adds confusion, and the potential for us to miss important e10s
bugs that are not necessarily caused by add-ons. I believe there's been
at least one occasion where safe mode caused us to erroneously assume
that a problem was occurring due to an add-on. Leaving safe-mode and
bisecting those add-ons resulted in us having all add-ons manually
disabled in non-safe-mode, and the bug persisting. That was a lot of
wasted time.

Anyhow, we're going to keep e10s enabled in safe mode. The bug for this
is https://bugzilla.mozilla.org/show_bug.cgi?id=1172491, but please
raise any concerns with this solution here in this thread.

Thanks!

-Mike

[1]: e10s, short for Electrolysis: https://wiki.mozilla.org/Electrolysis



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