Playwright 1.61.0 (2026-06-29) ships a Browser.setDefaultViewport Juggler
call the published firefox-13 binary does not implement, so an unpinned
pip install (the wrapper declared playwright>=1.40) breaks new_context on
fresh installs. Cap the dependency to <1.61 and force the blessed pin in
the e2e clean venv so CI tests the version users actually run.
The pool had the bare "franklin gothic", which isn't a real Win11 family and
wouldn't match the bundled franklingothic_x.ttf, so the always-present standard
fonts test failed and the family could drop off the whitelist. Use the real
name (the bundle reconciliation already maps it).
firefox-13 ships the bundled Windows fonts, makes navigator.languages /
Accept-Language / the Intl locale all follow the proxy country, and gates the
audio fingerprint noise off. The prefs.py change that emits the new font/locale
prefs needs this binary, so the bump and that change land together.
locale defaults to "auto" and resolves from the proxy egress country the same
way timezone does - it reuses the egress IP, maps the country to a BCP-47 locale
with the offline mmdb, and falls back to en-US. prefs emit juggler.locale.override
(the full Accept-Language list) so the binary keeps navigator.languages and the
Intl default locale in sync.
The audio fingerprint noise is off in the baseline. Font prefs match the new
binary: the sampled whitelist drives font.system.whitelist, system-ui is Segoe
UI, the bundled fonts are activated, and the CSS generics are pinned to Windows
defaults so they resolve on a non-Windows host too.
- BINARY_VERSION -> firefox-12 (self-calibrating font widths, per-family canvas
distinctness, render-noise that preserves solid reference renders).
- font_pool: the standard Windows fonts (Calibri, Franklin Gothic, Gadugi,
Javanese Text, Myanmar Text) move from the per-profile optional set to core,
so they are always present and the detected font set matches a real Windows
install on every host. Defensive dedup in derive_font_prefs.
- GPU persona applied on every platform (Linux/macOS present a coherent Windows
GPU + WebGL params); pool re-rooted on a real-device GPU mix; render seeds
recalibrated.
- prefs: emit absolute per-family font widths that the binary self-calibrates.
- geoip: always pull the latest mmdb via the releases/latest permalink, checked
each launch, offline-safe (no pinned tag that can 404).
- tests: per-font canvas distinctness, solid-readback purity under render-noise,
always-present standard-font invariant, no duplicate families.
The Date.now self-assignment was a stopgap that the page-realm fix (the
automation layer no longer touches the realm's built-ins before page scripts
run) made unnecessary; that binary support was never landed, so the pref is a
no-op on every shipped build. Remove it and its now-inaccurate comment.
