Firefox Profiler Deployment (November 12, 2025)

The latest version of the Firefox Profiler is now live! Check out the full changelog below to see what’s changed:

Highlights:

  • [Florian Quèze] Source view for marker stacks (#5633)
  • [Nazım Can Altınova] Add fallback to funcTable.lineNumber when computing line timings (#5644)
  • [Florian Quèze] Show the marker keys instead of the labels in marker tooltips when alt is pressed. (#5625)
  • [Florian Quèze] Hide track management UI in single track profiles. (#5656)
  • [Nazım Can Altınova] Do not switch to call tree when clicking the activity graph while on sample based panels (#5672)

Other Changes:

  • [Nazım Can Altınova] Use getEmptySourceTable instead of constructing the table manually (#5641)
  • [Francesco Lodolo] Add GitHub workflow to check Fluent reference files (#5647)
  • [Nazım Can Altınova] Switch from Gitpod to GitHub Codespaces (#5653)
  • [Nazım Can Altınova] Migrate from CircleCI to GitHub Actions (#5654)
  • [Nazım Can Altınova] Run the CI in the production branch and on every pull request (#5661)
  • [Nazım Can Altınova] Convert l10n-sync.js from Flow comment types to JSDoc comments for Typescript (#5659)
  • [Florian Quèze] Display correct unit in Stack Chart tooltips for size profiles. (#5658)
  • [Florian Quèze] Rename hiddenTrackCount to trackCount. (#5665)
  • [Florian Quèze] Cleanup the profile info panel for size profiles (show file size and name, hide empty sections). (#5657)
  • [Markus Stange] Use valibot for symbolication API response validation (#5666)
  • [Nazım Can Altınova] Make sure to fetch the full git history for l10n-sync job in CI (#5667)

Big thanks to our amazing localizers for making this release possible:

  • be: Mikalai Udodau
  • de: Michael Köhler
  • el: Jim Spentzos
  • en-GB: Ian Neal
  • es-CL: ravmn
  • fr: Théo Chevalier
  • fy-NL: Fjoerfoks
  • ia: Melo46
  • it: Francesco Lodolo [:flod]
  • nl: Mark Heijl
  • pt-BR: Marcelo Ghelman
  • ru: berry, Valery Ledovskoy
  • sv-SE: Andreas Pettersson
  • tr: Grk
  • zh-CN: Olvcpr423, wxie
  • zh-TW: Pin-guang Chen

Find out more about the Firefox Profiler on profiler.firefox.com! If you have any questions, join the discussion on our Matrix channel!