feder-cr/invisible_playwright

vfirefox-5 Bugfix

This release fixes issues for SREs watching stability and regressions.

Published 13d API Development

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✓ No known CVEs patched

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✓ No known CVEs patched in this version

Topics

anti-bot anti-detect-browser automation browser-automation browser-fingerprinting captcha

+14 more

captcha-bypass fingerprint fingerprint-spoofing fingerprintjs firefox hcaptcha headless-browser playwright recaptcha recaptcha-bypass scraping socks5 stealth web-scraping

ReleasePort's take

Light signal

editorial:auto 13d

Firefox 150 fixes crashes when overriding timezone in persistent contexts via new nsIDocShell.overrideTimezone API. Requires invisible_playwright 0.1.6.

Why it matters: Fixes crashes when overriding timezone in persistent contexts (severity 50). Standard upgrade for automation/testing workflows; no migration required.

Summary

AI summary

Implemented nsIDocShell.overrideTimezone in C++ to fix persistent context timezone crashes.

Changes in this release

Type	Severity	Summary	CVE
Feature	Medium	Adds `nsIDocShell.overrideTimezone` implementation in C++. Adds `nsIDocShell.overrideTimezone` implementation in C++. Source: llm_adapter@2026-05-21 Confidence: high	—
Dependency	Medium	Requires invisible_playwright 0.1.6 for persistent context timezone handling. Requires invisible_playwright 0.1.6 for persistent context timezone handling. Source: llm_adapter@2026-05-21 Confidence: low	—
Bugfix	Medium	Fixes crash when overriding timezone in persistent context. Fixes crash when overriding timezone in persistent context. Source: llm_adapter@2026-05-21 Confidence: high	—

Full changelog

Patched Firefox 150.0.1 build with the C7 closure — nsIDocShell.overrideTimezone IDL method now implemented in C++.

What changed since firefox-4

Content-side timezone propagation through Juggler used to call docShell.overrideTimezone(timezoneId) and crash with TypeError: docShell.overrideTimezone is not a function. On the non-persistent path the error was harmless (Juggler stayed up). On launch_persistent_context(timezone_id=...) it blocked the handshake and Playwright timed out at 180s. With the method present, persistent context starts in ~20s like the regular path.

All other binary content is identical to firefox-4.

SHA256

See checksums.txt.

Pair with

invisible_playwright 0.1.6 — the wrapper rev that drops the firefox-4-era workaround filtering locale/timezone_id out of the persistent context kwargs.

Patch details

docshell/base/nsIDocShell.idl declares boolean overrideTimezone(in AString aTimezone). docshell/base/nsDocShell.cpp implements it: walks GetWindow → inner window → global → realm → JS::SetRealmTimezoneOverride. Returns false only if the docShell has no current window or realm. Otherwise true.

The parent-process Browser.setTimezoneOverride path keeps using the existing BrowsingContext.TimezoneOverride FIELD + DidSet that propagate to every realm; this content-side method is its complement for realms that the docshell-restore just created.

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Related context

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Earlier breaking changes

vfirefox-3 Supersedes firefox-2; invisible_playwright BINARY_VERSION bumped to firefox-3 in 0.1.3.