2010368 - Implement privacy metrics widget data service and IPC layer

Status: RESOLVED FIXED

(Firefox :: Protections UI, enhancement, P2)

Description

[James Han]

Create the backend foundation for collecting and serving tracking protection statistics. This includes:

• PrivacyMetricsService that wraps TrackingDBService to query weekly block counts by category (trackers, fingerprinters, cookies, etc.)
• PrivacyMetrics JSWindowActor pair for cross-process communication (parent process has data, content process needs it)
• Basic unit tests for service logic and actor communication

Comment 1

[James Han]

Attachment: Bug 2010368 - Add PrivacyMetricsService and JSWindowActor IPC layer for privacy metrics. r?emz

This adds a new PrivacyMetricsService that wraps TrackingDBService to provide
weekly tracking protection statistics with 30-minute caching. The service
aggregates data by category (trackers, cookies, fingerprinters, cryptominers,
social trackers) for display in the privacy metrics widget.

Includes comprehensive xpcshell tests covering empty stats, aggregation,
multi-day data, caching behavior, and 7-day window filtering.

Comment 2

[James Han]

Attachment: Bug 2010368 - Add PrivacyMetricsService and JSWindowActor IPC layer for privacy metrics. r?emz

This patch adds backend infrastructure for the privacy metrics widget:

PrivacyMetricsService wraps TrackingDBService to provide weekly tracking
protection stats aggregated by category (trackers, cookies, fingerprinters,
cryptominers, social trackers).

JSWindowActor IPC layer provides PrivacyMetricsParent/Child for content pages
to access the service. Registered in DesktopActorRegistry for about:protections
with an enablePreference gate. The service is also accessible via RPMSendQuery
from AboutProtectionsParent.

The actor throws an error for private browsing contexts (callers should check
PBM status themselves via PrivateBrowsingUtils).

Includes xpcshell tests for the service and browser tests for the actors.

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/eee332c8275b
https://hg.mozilla.org/integration/autoland/rev/8a746edd3f8a
Add PrivacyMetricsService and JSWindowActor IPC layer for privacy metrics. r=emz

Comment 4

[Iulian Moraru]

Revert for causing linting failures on privacy-metrics-card.css.
This is also causing bc failures like these: https://treeherder.mozilla.org/logviewer?job_id=553536646&repo=autoland&task=Gld_H9muSZSdgOcdNRGAHQ.0&lineNumber=2935

• Push with failures

• Failure log

• Backout link

Comment 5

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/60b1fcfe8c4d
https://hg.mozilla.org/integration/autoland/rev/ebb5100fd987
Add PrivacyMetricsService and JSWindowActor IPC layer for privacy metrics. r=emz

Comment 6

[pstanciu]

https://hg.mozilla.org/mozilla-central/rev/ebb5100fd987