firefox-devtools · canova · Jun 29, 2026 · May 16, 2026 · May 16, 2026 · May 16, 2026
diff --git a/docs-developer/CHANGELOG-formats.md b/docs-developer/CHANGELOG-formats.md
@@ -6,6 +6,10 @@ Note that this is not an exhaustive list. Processed profile format upgraders can
 
 ## Processed profile format
 
+### Version 65
+
+The stack table's `frame` column (stored at `profile.shared.stackTable.frame`) can now optionally be stored as an `Int32Array`, for profiles loaded from [JsonSlabs](https://github.com/mstange/json-slabs/) files (.jslb, .jslb.gz). Regular JS / JSON arrays are still accepted.
+
 ### Version 64
 
 A new `SourceLocationTable` has been added to `profile.shared.sourceLocationTable`. It holds the original (pre-compilation) source positions produced by source map symbolication, paired with the generated `line`/`column` already on `FrameTable`.

diff --git a/locales/de/app.ftl b/locales/de/app.ftl
@@ -46,6 +46,11 @@ AppViewRouter--error-compare = Die Profile konnten nicht abgerufen werden.
 # https://profiler.firefox.com/from-url/http%3A%2F%2F127.0.0.1%3A3000%2Fprofile.json/
 AppViewRouter--error-from-localhost-url-safari = Aufgrund einer <a>spezifischen Einschränkung in Safari</a> kann { -profiler-brand-name } Profile vom lokalen Computer nicht in diesem Browser importieren. Bitte öffnen Sie diese Seite stattdessen in { -firefox-brand-name } oder Chrome.
     .title = Safari kann lokale Profile nicht importieren
+# This error message is displayed when the profile is in a newer format version
+# than this build of the Profiler is able to read.
+AppViewRouter--error-profile-version =
+    Dieses Profil verwendet ein Format, das von dieser Version von { -profiler-brand-name } nicht unterstützt wird.
+    Versuchen Sie, die Seite zu aktualisieren, um zu überprüfen, ob ein Update für { -profiler-brand-name } verfügbar ist.
 AppViewRouter--route-not-found--home =
     .specialMessage = Die URL, die Sie erreichen wollten, wurde nicht erkannt.
 

diff --git a/locales/el/app.ftl b/locales/el/app.ftl
@@ -49,6 +49,11 @@ AppViewRouter--error-from-localhost-url-safari =
     εισαγάγει προφίλ από τη συσκευή σε αυτό το πρόγραμμα περιήγησης.
     Ανοίξτε αυτήν τη σελίδα στο { -firefox-brand-name } ή το Chrome.
     .title = Το Safari δεν μπορεί να εισαγάγει τοπικά προφίλ
+# This error message is displayed when the profile is in a newer format version
+# than this build of the Profiler is able to read.
+AppViewRouter--error-profile-version =
+    Αυτό το προφίλ χρησιμοποιεί μια μορφή που δεν υποστηρίζεται από αυτήν την έκδοση του { -profiler-brand-name }.
+    Δοκιμάστε να ανανεώσετε τη σελίδα για να ελέγξετε αν διατίθεται ενημέρωση για το { -profiler-brand-name }.
 AppViewRouter--route-not-found--home =
     .specialMessage = Δεν αναγνωρίστηκε το URL που προσπαθήσατε να μεταβείτε.
 
@@ -894,6 +899,10 @@ TrackMemoryGraph--relative-memory-at-this-time2 = { $value }
 #   $value (String) - the memory range across the graph (e.g. "5MB")
 TrackMemoryGraph--memory-range-in-graph2 = { $value }
     .label = εύρος μνήμης στο γράφημα
+# Variables:
+#   $value (String) - count of allocations and deallocations since the previous sample
+TrackMemoryGraph--allocations-and-deallocations-since-the-previous-sample2 = { $value }
+    .label = εκχωρήσεις και αποδεσμεύσεις από το προηγούμενο δείγμα
 
 ## TrackProcessCPUGraph
 ## This is used to show the CPU usage of a process over time in the timeline.
@@ -948,6 +957,11 @@ TrackPower--tooltip-average-power-watt = { $value } W
 #   $value (String) - the power value at this location
 TrackPower--tooltip-average-power-milliwatt = { $value } mW
     .label = Μέση ισχύς στην τρέχουσα επιλογή
+# This is used in the tooltip when the power value uses the microwatt unit.
+# Variables:
+#   $value (String) - the power value at this location
+TrackPower--tooltip-average-power-microwatt = { $value } μW
+    .label = Μέση ισχύς στην τρέχουσα επιλογή
 # This is used in the tooltip when the energy used in the current range uses the
 # kilowatt-hour unit.
 # Variables:

diff --git a/locales/en-GB/app.ftl b/locales/en-GB/app.ftl
@@ -49,6 +49,11 @@ AppViewRouter--error-from-localhost-url-safari =
     to import profiles from the local machine in this browser. Please open 
     this page in { -firefox-brand-name } or Chrome instead.
     .title = Safari cannot import local profiles
+# This error message is displayed when the profile is in a newer format version
+# than this build of the Profiler is able to read.
+AppViewRouter--error-profile-version =
+    This profile uses a format that is not supported by this version of { -profiler-brand-name }.
+    Try refreshing the page to check if there is an update available for { -profiler-brand-name }.
 AppViewRouter--route-not-found--home =
     .specialMessage = The URL you tried to reach was not recognised.
 

@@ -54,6 +54,12 @@ AppViewRouter--error-from-localhost-url-safari =
     this page in { -firefox-brand-name } or Chrome instead.
     .title = Safari cannot import local profiles
 
+# This error message is displayed when the profile is in a newer format version
+# than this build of the Profiler is able to read.
+AppViewRouter--error-profile-version =
+    This profile uses a format that is not supported by this version of { -profiler-brand-name }.
+    Try refreshing the page to check if there is an update available for { -profiler-brand-name }.
+
 AppViewRouter--route-not-found--home =
     .specialMessage = The URL you tried to reach was not recognized.
 

diff --git a/locales/es-CL/app.ftl b/locales/es-CL/app.ftl
@@ -46,6 +46,12 @@ AppViewRouter--error-compare = No se pudieron recuperar los perfiles.
 # https://profiler.firefox.com/from-url/http%3A%2F%2F127.0.0.1%3A3000%2Fprofile.json/
 AppViewRouter--error-from-localhost-url-safari = Debido a una <a>limitación específica en Safari</a>, { -profiler-brand-name } no puede importar perfiles de la máquina local en este navegador. Por favor, abre esta página en { -firefox-brand-name } o Chrome en su lugar.
     .title = Safari no puede importar perfiles locales
+# This error message is displayed when the profile is in a newer format version
+# than this build of the Profiler is able to read.
+AppViewRouter--error-profile-version =
+    Este perfil utiliza un formato no compatible con esta versión de { -profiler-brand-name }.
+
+    Intenta actualizar la página para comprobar si hay alguna actualización disponible para { -profiler-brand-name }.
 AppViewRouter--route-not-found--home =
     .specialMessage = La URL a la que intentaste acceder no fue reconocida.
 

diff --git a/locales/fr/app.ftl b/locales/fr/app.ftl
@@ -46,6 +46,11 @@ AppViewRouter--error-compare = Impossible de récupérer les profils.
 # https://profiler.firefox.com/from-url/http%3A%2F%2F127.0.0.1%3A3000%2Fprofile.json/
 AppViewRouter--error-from-localhost-url-safari = En raison d’une <a>limitation spécifique à Safari</a>, { -profiler-brand-name } ne peut pas importer de profils depuis la machine locale dans ce navigateur. Veuillez ouvrir cette page dans { -firefox-brand-name } ou Chrome à la place.
     .title = Safari ne peut pas importer de profils locaux
+# This error message is displayed when the profile is in a newer format version
+# than this build of the Profiler is able to read.
+AppViewRouter--error-profile-version =
+    Ce profil utilise un format qui n’est pas pris en charge par cette version de { -profiler-brand-name }.
+    Essayez d’actualiser la page pour vérifier si une mise à jour est disponible pour { -profiler-brand-name }.
 AppViewRouter--route-not-found--home =
     .specialMessage = L’URL que vous avez tenté d’atteindre n’a pas été trouvée
 

diff --git a/locales/fur/app.ftl b/locales/fur/app.ftl
@@ -811,6 +811,32 @@ TrackNameButton--hide-track =
 TrackNameButton--hide-process =
     .title = Plate procès
 
+## TrackMemoryGraph
+## This is used to show the memory graph of that process in the timeline part of
+## the UI. To learn more about it, visit:
+## https://profiler.firefox.com/docs/#/./memory-allocations?id=memory-track
+
+# Variables:
+#   $value (String) - the relative memory at this time (e.g. "5MB")
+TrackMemoryGraph--relative-memory-at-this-time2 = { $value }
+    .label = memorie relative a chest pont
+# Variables:
+#   $value (String) - the memory range across the graph (e.g. "5MB")
+TrackMemoryGraph--memory-range-in-graph2 = { $value }
+    .label = interval di memorie tal grafic
+# Variables:
+#   $value (String) - count of allocations and deallocations since the previous sample
+TrackMemoryGraph--allocations-and-deallocations-since-the-previous-sample2 = { $value }
+    .label = assegnazion e disassegnazion dal campion di prime
+
+## TrackProcessCPUGraph
+## This is used to show the CPU usage of a process over time in the timeline.
+
+# Variables:
+#   $value (String) - the CPU usage at this sample (e.g. "50%")
+TrackProcessCPUGraph--cpu = { $value }
+    .label = CPU
+
 ## TrackPower
 ## This is used to show the power used by the CPU and other chips in a computer,
 ## graphed over time.
@@ -856,6 +882,11 @@ TrackPower--tooltip-average-power-watt = { $value } W
 #   $value (String) - the power value at this location
 TrackPower--tooltip-average-power-milliwatt = { $value } mW
     .label = Consum medi te selezion atuâl
+# This is used in the tooltip when the power value uses the microwatt unit.
+# Variables:
+#   $value (String) - the power value at this location
+TrackPower--tooltip-average-power-microwatt = { $value } μW
+    .label = Consum medi te selezion corinte
 # This is used in the tooltip when the energy used in the current range uses the
 # kilowatt-hour unit.
 # Variables:

diff --git a/locales/fy-NL/app.ftl b/locales/fy-NL/app.ftl
@@ -49,6 +49,11 @@ AppViewRouter--error-from-localhost-url-safari =
     profilen fan de lokale kompjûter yn dizze browser ymportearje. Iepenje yn stee dêrfan
     dizze side yn { -firefox-brand-name } of Chrome.
     .title = Safari kan geen lokale profielen importeren
+# This error message is displayed when the profile is in a newer format version
+# than this build of the Profiler is able to read.
+AppViewRouter--error-profile-version =
+    Dit profyl brûkt in yndieling dy’t net troch dizze ferzje fan { -profiler-brand-name } stipe wurdt.
+    Probearje de side te ferfarskjen om te kontrolearjen oft der in fernijing beskikber is foar { -profiler-brand-name }.
 AppViewRouter--route-not-found--home =
     .specialMessage = De URL dy’t jo probearre te berikken, waard net werkend.
 

diff --git a/locales/ia/app.ftl b/locales/ia/app.ftl
@@ -49,6 +49,11 @@ AppViewRouter--error-from-localhost-url-safari =
     importar profilos ab le local apparato in iste browser. Per favor aperi 
     in vice iste pagina in { -firefox-brand-name } o Chrome.
     .title = Safari non pote importar  profilos local
+# This error message is displayed when the profile is in a newer format version
+# than this build of the Profiler is able to read.
+AppViewRouter--error-profile-version =
+    Iste profilo usa un formato que non es supportate per iste version de { -profiler-brand-name }.
+    Essaya refrescar le pagina pro verificar si il ha un actualisation disponibile pro { -profiler-brand-name }.
 AppViewRouter--route-not-found--home =
     .specialMessage = Le URL que tu tentava attinger non ha essite recognoscite.
 

diff --git a/locales/it/app.ftl b/locales/it/app.ftl
@@ -46,6 +46,11 @@ AppViewRouter--error-compare = Impossibile recuperare i profili.
 # https://profiler.firefox.com/from-url/http%3A%2F%2F127.0.0.1%3A3000%2Fprofile.json/
 AppViewRouter--error-from-localhost-url-safari = A causa di una <a>limitazione specifica di Safari</a>, { -profiler-brand-name } non può importare profili dal dispositivo locale in questo browser. Aprire questa pagina in { -firefox-brand-name } o Chrome.
     .title = Impossibile importare profili locali in Safari
+# This error message is displayed when the profile is in a newer format version
+# than this build of the Profiler is able to read.
+AppViewRouter--error-profile-version =
+    Questo profilo utilizza un formato non compatibile con questa versione di { -profiler-brand-name }.
+    Ricarica la pagina per verificare se è disponibile un aggiornamento per { -profiler-brand-name }.
 AppViewRouter--route-not-found--home =
     .specialMessage = L’URL che hai cercato di raggiungere non è stato riconosciuto.
 

diff --git a/locales/nl/app.ftl b/locales/nl/app.ftl
@@ -49,6 +49,11 @@ AppViewRouter--error-from-localhost-url-safari =
     profielen van de lokale computer in deze browser importeren. Open in plaats daarvan
     deze pagina in { -firefox-brand-name } of Chrome.
     .title = Safari kan geen lokale profielen importeren
+# This error message is displayed when the profile is in a newer format version
+# than this build of the Profiler is able to read.
+AppViewRouter--error-profile-version =
+    Dit profiel gebruikt een indeling die niet door deze versie van { -profiler-brand-name } wordt ondersteund.
+    Probeer de pagina te vernieuwen om te controleren of er een update beschikbaar is voor { -profiler-brand-name }.
 AppViewRouter--route-not-found--home =
     .specialMessage = De URL die u probeerde te bereiken, werd niet herkend.
 

diff --git a/locales/ru/app.ftl b/locales/ru/app.ftl
@@ -49,6 +49,11 @@ AppViewRouter--error-from-localhost-url-safari =
     импортировать профили с локальной машины в этот браузер. Пожалуйста, откройте
     эту страницу в { -firefox-brand-name } или Chrome.
     .title = Safari не может импортировать локальные профили
+# This error message is displayed when the profile is in a newer format version
+# than this build of the Profiler is able to read.
+AppViewRouter--error-profile-version =
+    Этот профиль использует формат, который не поддерживается этой версией { -profiler-brand-name }.
+    Попробуйте обновить страницу, чтобы проверить, доступно ли обновление для { -profiler-brand-name }.
 AppViewRouter--route-not-found--home =
     .specialMessage = URL-адрес, который вы пытались открыть, не был распознан.
 

diff --git a/locales/sv-SE/app.ftl b/locales/sv-SE/app.ftl
@@ -49,6 +49,11 @@ AppViewRouter--error-from-localhost-url-safari =
     { -profiler-brand-name } importera profiler från den lokala datorn i den här webbläsaren. Öppna
     den här sidan i { -firefox-brand-name } eller Chrome istället.
     .title = Safari kan inte importera lokala profiler
+# This error message is displayed when the profile is in a newer format version
+# than this build of the Profiler is able to read.
+AppViewRouter--error-profile-version =
+    Den här profilen använder ett format som inte stöds av den här versionen av { -profiler-brand-name }.
+    Testa att uppdatera sidan för att kontrollera om det finns en tillgänglig uppdatering för { -profiler-brand-name }.
 AppViewRouter--route-not-found--home =
     .specialMessage = Webbadressen du försökte nå kändes inte igen.
 

diff --git a/locales/zh-TW/app.ftl b/locales/zh-TW/app.ftl
@@ -46,6 +46,11 @@ AppViewRouter--error-compare = 無法取得效能檢測檔。
 # https://profiler.firefox.com/from-url/http%3A%2F%2F127.0.0.1%3A3000%2Fprofile.json/
 AppViewRouter--error-from-localhost-url-safari = 由於 <a>Safari 的特殊限制</a>，{ -profiler-brand-name } 無法從這套瀏覽器自本機匯入效能檢測檔。請改用 { -firefox-brand-name } 或 Chrome 開啟此頁面。
     .title = 無法使用 Safari 匯入本機效能檢測檔
+# This error message is displayed when the profile is in a newer format version
+# than this build of the Profiler is able to read.
+AppViewRouter--error-profile-version =
+    此版本的 { -profiler-brand-name } 不支援此效能檢測檔使用的格式。
+    請嘗試重新整理頁面，看看是否有 { -profiler-brand-name } 的更新可以使用。
 AppViewRouter--route-not-found--home =
     .specialMessage = 無法處理您嘗試開啟的網址。
 

@@ -70,7 +70,7 @@
     "@codemirror/lang-rust": "^6.0.2",
     "@codemirror/language": "^6.12.3",
     "@codemirror/state": "^6.6.0",
-    "@codemirror/view": "^6.43.0",
+    "@codemirror/view": "^6.43.1",
     "@firefox-devtools/react-contextmenu": "^5.2.4",
     "@fluent/bundle": "^0.19.1",
     "@fluent/langneg": "^0.7.0",
@@ -100,7 +100,7 @@
     "mixedtuplemap": "^1.0.0",
     "namedtuplemap": "^1.0.0",
     "photon-colors": "^3.3.2",
-    "protobufjs": "^8.6.3",
+    "protobufjs": "^8.6.5",
     "query-string": "^9.4.0",
     "react": "~19.1.8",
     "react-dom": "~19.1.8",
@@ -132,7 +132,7 @@
     "@types/jest": "^30.0.0",
     "@types/node": "^24.13.2",
     "@types/query-string": "^6.3.0",
-    "@types/react": "^19.2.15",
+    "@types/react": "^19.2.17",
     "@types/react-dom": "^19.2.3",
     "@types/redux-logger": "^3.0.6",
     "@types/tgwf__co2": "^0.14.2",
@@ -143,7 +143,7 @@
     "babel-plugin-module-resolver": "^5.0.3",
     "browserslist": "^4.28.2",
     "browserslist-to-esbuild": "^2.1.1",
-    "caniuse-lite": "^1.0.30001793",
+    "caniuse-lite": "^1.0.30001799",
     "cross-env": "^10.1.0",
     "cross-spawn": "^7.0.6",
     "devtools-license-check": "^0.9.0",
@@ -169,12 +169,12 @@
     "lockfile-lint": "^5.0.0",
     "npm-run-all2": "^8.0.4",
     "open": "^11.0.0",
-    "oxfmt": "^0.51.0",
+    "oxfmt": "^0.56.0",
     "patch-package": "^8.0.1",
     "postcss": "^8.5.15",
     "postinstall-postinstall": "^2.1.0",
     "rimraf": "^6.1.3",
-    "stylelint": "^17.12.0",
+    "stylelint": "^17.13.0",
     "stylelint-config-idiomatic-order": "^10.0.0",
     "stylelint-config-standard": "^40.0.0",
     "typescript": "^6.0.3",

diff --git a/profiler-cli/guide.txt b/profiler-cli/guide.txt
@@ -117,6 +117,7 @@ HANDLE SYSTEM
     t-0, t-1   Thread handles (from "profile info")
     m-1234     Marker handles (from "thread markers")
     f-12       Function handles (from "thread samples", "thread functions")
+    c-0, c-1   Counter handles (from "counter list" or "profile info")
     ts-6       Timestamp handles (named points in time, usable with "zoom push")
 
   Handle lifetime and stability:
@@ -127,6 +128,8 @@ HANDLE SYSTEM
     m-N      thread markers    No -- rebuilt each time the daemon starts
     f-N      thread samples,   Yes -- direct index into the profile's function
              thread functions  table; same profile always yields the same f-N
+    c-N      counter list      Yes -- direct index into the profile's counter
+                               array; same profile always yields the same c-N
     ts-N     thread markers    No -- position-based, session-scoped
     ──────────────────────────────────────────────────────────────────────────
 
@@ -215,6 +218,31 @@ FILTERS
       profiler-cli filter push --during-marker --search Paint
 
 
+COUNTERS
+
+  Counters are time series the profiler records alongside samples: memory usage,
+  network bandwidth, process CPU, power, and similar. Each counter has a handle
+  (c-0, c-1, ...) and carries its own display metadata (label, unit, graph type).
+
+    profiler-cli counter list            List all counters with one-line summaries
+    profiler-cli counter info c-0        Detailed info and stats for one counter
+
+  Counters also appear in "profile info", listed under their owning process
+  next to that process's threads (much like the timeline track list).
+
+  The stats shown come from the counter's own tooltip schema, so they match the
+  timeline tooltips. Each counter reports its whole-range aggregates, e.g. the
+  memory range for Memory, data transferred for Bandwidth, or energy used (with a
+  CO2e estimate) for Power.
+
+  All counter stats respect the current zoom: with no zoom they cover the whole
+  profile; after "zoom push" they cover the committed range. Combine with zoom to
+  see, for example, how much memory a specific time window allocated:
+
+      profiler-cli zoom push 2.7,3.1
+      profiler-cli counter info c-0
+
+
 JSON OUTPUT
 
   Add --json to any command to get structured JSON output, suitable for piping to jq

diff --git a/profiler-cli/package.json b/profiler-cli/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@firefox-devtools/profiler-cli",
-  "version": "0.2.1",
+  "version": "0.3.0",
   "description": "Command-line interface for querying Firefox Profiler profiles with persistent daemon sessions",
   "scripts": {
     "prepublishOnly": "node ../scripts/verify-profiler-cli-build.mjs"