1217557 - [driver] set browser.tabs.remote.autostart to False in GeckoInstance.required_prefs

Status: RESOLVED FIXED

Description

[Maja Frydrychowicz (:maja_zf) (away)]

There's an --e10s option available in the Marionette Python client. I think '--e10s' should mean 'use e10s' and the absence of the flag should mean 'don't use e10s', even after e10s ships someday on the Release channel. [1] 

That's not the case right now. When the --e10s flag is absent, only "browser.tabs.remote.autostart.1" and "browser.tabs.remote.autostart.2" are set to False (marionette-driver/geckoinstance.py). If the default value of "browser.tabs.remote.autostart" changes in the future, the behaviour of many test jobs will silently change with it.

[1] firefox-ui-tests enforce this definition - https://github.com/mozilla/firefox-ui-tests/blob/mozilla-central/firefox_ui_harness/runners/base.py#L67-L68.

Comment 1

[Henrik Skupin (:whimboo) [⌚️UTC+1]]

Totally agree here. That was the main reason afair to customize that initially in our Firefox UI tests.

Comment 2

[Maja Frydrychowicz (:maja_zf) (away)]

Created attachment 8682228 [details]
MozReview Request: Bug 1217557 - set browser.tabs.remote.autostart to False in GeckoInstance; r?automatedtester

Bug 1217557 - set browser.tabs.remote.autostart to False in GeckoInstance; r?automatedtester

Comment 3

[David Burns :automatedtester]

Comment on attachment 8682228 [details]
MozReview Request: Bug 1217557 - set browser.tabs.remote.autostart to False in GeckoInstance; r?automatedtester

https://reviewboard.mozilla.org/r/24001/#review21477

Comment 4

[Maja Frydrychowicz (:maja_zf) (away)]

https://treeherder.mozilla.org/#/jobs?repo=try&revision=4827bf333fe8

Comment 5

[Pulsebot]

https://hg.mozilla.org/integration/mozilla-inbound/rev/70df5b203edb

Comment 6

[Wes Kocher (:KWierso)]

https://hg.mozilla.org/mozilla-central/rev/70df5b203edb