1886538 - Investigate browser.startup.homepage_override.mstone pref impact on new user onboarding

Status: ASSIGNED

(Firefox :: Messaging System, task, P2)

Description

[Punam Dahiya [:pdahiya]]

Scope of this bug is to validate if setting browser.startup.homepage_override.mstone pref is enough to not show about:welcome during first startup. By default browser.startup.homepage_override.mstone isn't set for brand new profiles on Firefox installs, however there has been issue reported for custom builds when about:welcome page isn't shown due to mstone pref set by mistake.

https://mozilla.slack.com/archives/C90HG2UQH/p1710940398696639
https://searchfox.org/mozilla-central/rev/b73676a106c1655030bb876fd5e0a6825aee6044/browser/components/BrowserContentHandler.sys.mjs#221

Comment 1

[Shane Hughes [:aminomancer]]

Users commonly set this to disable about:welcome and maybe some other stuff.

user_pref("browser.startup.homepage_override.mstone", "ignore");

Comment 2

[Punam Dahiya [:pdahiya]]

Attachment: Bug 1886538 - Ignore browser.startup.homepage_override.mstone default pref value from custom builds

Comment 3

[Punam Dahiya [:pdahiya]]

Updated attached patch with findings and suggested optimization https://phabricator.services.mozilla.com/D211253#inline-1169723 and moving priority to P2 as its not a blocker for release