1826231 - Reset the set-to-default group limit when Firefox has been unset as the default browser

Status: ASSIGNED

(Firefox :: Messaging System, enhancement, P2)

Description

[Jason Prickett]

When Fx is unset as the default browser, we should reset the message group limit for the set-to-default group so that "set default" messages can be shown again, despite them maybe being shown in the past.

Comment 1

[Shane Hughes [:aminomancer]]

I guess we should just wipe all the message impressions for the group?

Comment 2

[Shane Hughes [:aminomancer]]

Attachment: Bug 1826231 - Reset the set-to-default message group on default browser unset. r=#omc-reviewers

At startup, we measure whether Firefox is the default browser. If it was
previously set to default, we will have recorded it in the
BROWSER_IS_USER_DEFAULT histogram. So before collecting the current
state, we can compare it to the histogram's previous sum to determine
whether Firefox has been unset as default browser. If so, we can then
clear all impressions for the set-to-default group, so these messages
can begin showing again.