firefox.exe --version on Windows prints the version string but may
return non-zero exit code (sub-process fork quirk). The previous check
treated that as a launch failure, producing a false-positive failure
across the whole matrix while the binary actually launched cleanly.
Switch to matching the printed output instead, so we only fail when the
binary really can't start.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Triggered by issue #22 (firefox-7 SxS mismatch reported on Win11 26200
by jannusdorfer-create). Verifies the shipped binary launches cleanly
on every Windows runner GitHub offers: windows-2022, windows-2025,
windows-latest, across Python 3.11 / 3.12 / 3.13.
Each cell does the reporter's exact flow: fresh checkout, pip install
from source, python -m invisible_playwright fetch, then runs the
InvisiblePlaywright(seed=9128) snippet.
If all cells pass the bug is environment-specific to the reporter
(corporate edition, EDR, GPO). If any cell fails the same way we ship
a sidecar mozglue.manifest in the next release.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
