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[Bug]: locale is not propagated to workers in firefox #38919
Description
Version
Steps to reproduce
This test passes in CI, but not locally. I assume it's because CI locale happens to give the same output as es-MX. If you change the locale to ru-RU, it should also fail in CI.
It seems that workers are not respecting the context locale.
Expected behavior
Workers should be respecting context locale.
Actual behavior
Workers are using system locale.
Additional context
found during microsoft/playwright-python#3026
Environment
System:
OS: macOS 26.2
CPU: (12) arm64 Apple M3 Pro
Memory: 133.67 MB / 18.00 GB
Binaries:
Node: 20.19.0 - /Users/skn0tt/.local/state/fnm_multishells/66603_1769161758461/bin/node
Yarn: 1.22.22 - /Users/skn0tt/.local/state/fnm_multishells/66603_1769161758461/bin/yarn
npm: 9.9.4 - /Users/skn0tt/.local/state/fnm_multishells/66603_1769161758461/bin/npm
pnpm: 10.28.1 - /Users/skn0tt/.local/state/fnm_multishells/66603_1769161758461/bin/pnpm
Deno: 2.5.2 - /opt/homebrew/bin/deno
IDEs:
VSCode: 1.108.1 - /opt/homebrew/bin/code
Claude Code: 2.1.15 - /opt/homebrew/bin/claude
Languages:
Bash: 3.2.57 - /bin/bash
Activity
Skn0tt commentedon Jan 23, 2026
Andrey Lushnikov (@aslushnikov) could you take a look? this seems to have regressed in the last roll.
[-][Bug]: locale is not propagated to workers[/-][+][Bug]: locale is not propagated to workers in firefox[/+]Torgen commentedon Feb 1, 2026
I had issues with
navigator.languagebeing undefined in the latest version. Does that seem like it could be related?test: add tests to cover timezone/locale emulation in workers
aslushnikov commentedon Feb 4, 2026
Dan Rosart (@Torgen) this i cannot reproduce; can you please file a separate issue?
aslushnikov commentedon Feb 10, 2026
Filed upstream bugs:
aslushnikov commentedon May 5, 2026
This is still not fixed upstream; I pinged Mozilla folks. If there are no plans to fix upstream, we should consider bringing back our homegrown timezone & locale implementation.
aslushnikov commentedon Jul 6, 2026
This will be fixed with the roll to 152.
chore(firefox): update version to 153.0, unskip worker locale/timezon…
dgozman commentedon Jul 22, 2026
Fixed by #41938.
conformance: headed chromium skip-list — showDirectoryPicker + timezo…
chore: roll to 1.62.0
chore: roll to 1.62.0
chore: roll to 1.62.0
chore: roll to 1.62.0
chore(driver): roll to 1.62.0