E10s Update: October 24

Executive Summary

As of October 18, across all release channel activity we recorded, e10s is activated for 25% of the total release population (across all releases). Although some users (about 80K) have opted out of using e10s, this number is very small compared to the total number of users on test (33.5M). We are continuing to focus on resolving our two top issues to be sure we continue to trend with the majority of our users staying in the test cohort:
- Top crash which has lead us to temporarily disable e10s for the Russian locale (5% of our e10s test population). Status: Patch review is ongoing; still a top priority for the networking team.
- Slowness during tab switching

Investigation continues for bug 1300411 - user reports excessive load spinning when switching tabs with e10s in 48.0.2 release. Here is what we know:
- There are 6 individual reports; engineering is actively engaged with 1-2 people. One of which that is the most reproducible seems related to an issue with bug 1279086 google docs. SV has been able to manually reproduce the issue.
- In order to better surmise the scale of the this issue, we are landing opt-out telemetry probes as of Firefox 49 bug 1301104 and bug 1301435.
- We are also disabling e10s for users who are experiencing the spinner upon opening a new tab. This will be included as a ridealong for the next dot release for 49 (if we decide to ship one).
We are close with a fix for our top issue that caused us to temporarily disable E10s for the Russian Locale since the crash impacts a popular email site. Initial tests show that the fix seems to be working as expected.

See full Add-Ons status, here
We shipped Firefox 49 with a set of compatible Add-Ons enabled.
We will continue A/B experiments on Beta and will maintain the same % of the population (50% of eligible).
General roll-out plan for including extensions is here.

A11y and touchscreen support has landed in 51. We are targeting 52 so we can:
- Benefit from the touch events work happening APZ
- Our primary blocker bug 1297549
- We have about 12 issues we would like to fix before rolling out
- Enabling tests
- Optimization work and APZ dependency which is slated for 52
NVDA is the first client we plan on achieving compliance with. We feel that if A11y can work with NVDA, we should be at about 90% of functionality with other, similar clients.

bug 1277831 E10s support for RTL versions of Firefox on Windows and Mac is on track for Firefox 50. Softvision has just signed off on RTL support for e10s in their mid-aurora sign-offs.
E10s support for RTL versions of Firefox on Linux has landed for 52.

We are at 90% Test coverage for all channels. We have touched base with all module owners. Not all of them have signed off specifically but we are calling it within acceptable range for shipping at this point.
Working to get tests enabled for A11y is currently our focus.

Bi-weekly meetings have commenced for e10s-multi, see more info:

Date	Trunk	Aurora	Beta	Release
3-07	48 default	47 default	46 A/B Tests	45 off
4-18	49 default	48 default	47 A/B Tests, Possible Rollout (add-ons = ally = no)	46 off
6-07	50 default	49 default	48 Possible Rollout (add-ons + ally = no)	47 off
8-02	51 default	50 default	49 Possible Rollout (add-ons + ally = no)	48 Rollout (add-ons + ally = no)
9-20	52 default (multi-lands)	51 default	50 Rollout (add-ons = yes + ally = no)	49 Rollout (known good add-ons = yes, ally = no)
11-8	53 default (multi-enabled)	52 (multi =yes)	51 default	50 rollout + known good add-ons