Firefox Profiler Deployment (July 21, 2026)

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

Highlights:

  • [fatadel] Show counter values over time in profiler-cli (#6136)
  • [Markus Stange] More typed arrays: sample + counter times, some frametable columns (#6139)
  • [Nazım Can Altınova] Add marker handles to profiler-cli thread network (#6172)
  • [Nazım Can Altınova] Surface network activity across profiler-cli (#6175)
  • [Nazım Can Altınova] Add profile meta command to profiler-cli (#6177)
  • [Markus Stange] Allow raw marker table’s startTime and endTime columns to be Float64Array (#6169)

Other Changes:

  • [Sky Ning] Skip preview links for non-main PRs (#6161)
  • [spokodev] fix(gecko-upgrade): don’t crash on a counter with empty sample_groups (#6160)
  • [Markus Stange] Make profile-conversion snapshots more compact and meaningful (#6152)
  • [Nazım Can Altınova] Only render a marker url field as a link when the whole value is a URL (#6163)
  • [fatadel] Show each counter’s owning process in profiler-cli (#6164)
  • [Nazım Can Altınova] Document the pre-existing thread info and network JSON schemas in the cli (#6171)
  • [Markus Stange] Copy column contents in getRawSamplesTableBuilderFromExisting for consistency (#6168)
  • [Markus Stange] Convert eligible columns to typed arrays when outputting from profiler-edit (#6167)
  • [Markus Stange] Remove unused samples.thread column (#6151)
  • [Markus Stange] Fixed botched merge which broke ‘yarn ts’ (#6174)
  • [Markus Stange] Update json-slabs 0.3.0 → 0.4.0 (major) (#6176)
  • [nightcityblade] Fix light theme text selection colors (#6186)
  • [Nazım Can Altınova] Import source map URLs from Chrome DevTools traces (#6190)
  • [Nazım Can Altınova] Rename yarn build-profiler-cli script to build-cli (#6191)
  • [Nazım Can Altınova] Migrate husky to version 9 (#6201)
  • [Nazım Can Altınova] Fix horizontal overflow when the transform navigator is long (#6199)
  • [fatadel] Add a ‘hexadecimal’ marker schema field format (#6197)
  • [Nazım Can Altınova] Bump source-map to 0.8.0 and remove the old type workaround (#6202)
  • [Nazım Can Altınova] :clockwise_vertical_arrows: Sync: l10n → main (July 21, 2026) (#6209)

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

  • fr: parmegiani.thomas
  • fr: Théo Chevalier
  • sr: Марко Костић (Marko Kostić)
  • sv-SE: Luna Jernberg
  • tr: Grk
  • zh-CN: Ariel
  • zh-CN: Olvcpr423

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

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