tor-browser

commit 77c4df94e78bf73c33b75c9afea2def173e2b675
parent 7f7c96f16bc5e6f045bcd1bb3cfdf7974f30903e
Author: Tom Ritter <tom@mozilla.com>
Date:   Mon, 29 Dec 2025 20:28:58 +0000

Bug 2005864: Add a metric reporting the web-exposed timezone name r=timhuang

Differential Revision: https://phabricator.services.mozilla.com/D276711

Diffstat:
M
toolkit/components/resistfingerprinting/UserCharacteristicsPageService.sys.mjs
 | 
1
+
M
toolkit/components/resistfingerprinting/content/usercharacteristics.js
 | 
14
++++++++++++++
M
toolkit/components/resistfingerprinting/metrics.yaml
 | 
18
++++++++++++++++++

3 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/toolkit/components/resistfingerprinting/UserCharacteristicsPageService.sys.mjs b/toolkit/components/resistfingerprinting/UserCharacteristicsPageService.sys.mjs
@@ -665,6 +665,7 @@ export class UserCharacteristicsPageService {
         "audioFrames",
         "audioRate",
         "audioChannels",
+        "timezoneWeb",
       ],
     };
 
diff --git a/toolkit/components/resistfingerprinting/content/usercharacteristics.js b/toolkit/components/resistfingerprinting/content/usercharacteristics.js
@@ -996,6 +996,19 @@ async function populateAudioDeviceProperties() {
   };
 }
 
+async function populateTimezoneWeb() {
+  try {
+    const timezone = Intl.DateTimeFormat().resolvedOptions().timeZone;
+    return {
+      timezoneWeb: timezone || "",
+    };
+  } catch (e) {
+    return {
+      timezoneWeb: "",
+    };
+  }
+}
+
 // A helper function to generate an array of asynchronous functions to populate
 // canvases using both software and hardware rendering.
 function getCanvasSources() {
@@ -1063,6 +1076,7 @@ async function startPopulating() {
     populateCSSQueries,
     populateNavigatorProperties,
     populateAudioDeviceProperties,
+    populateTimezoneWeb,
   ];
   // Catches errors in promise-creating functions. E.g. if populateVoiceList
   // throws an error before returning any of its `key: (Promise<any> | any)`
diff --git a/toolkit/components/resistfingerprinting/metrics.yaml b/toolkit/components/resistfingerprinting/metrics.yaml
@@ -403,6 +403,24 @@ characteristics:
     data_sensitivity:
       - interaction
 
+  timezone_web:
+    type: string
+    description: >
+      The timezone string reported via the web using Intl API (e.g. America/New_York)
+    lifetime: application
+    send_in_pings:
+      - user-characteristics
+    notification_emails:
+      - tom@mozilla.com
+    bugs:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1879151
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=2005864
+    data_reviews:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=2005864
+    expires: never
+    data_sensitivity:
+      - interaction
+
   system_locale:
     type: string
     description: >