On macOS the shared headless browser daemon launched from the system Google Chrome app bundle, running as a com.google.Chrome instance. macOS LaunchServices could then deliver the user's open-URL Apple Events to the daemon instead of their own Chrome, silently swallowing link clicks.
ensureChromiumExecutable now prefers the isolated Chrome for Testing binary (com.google.chrome.for.testing) on macOS, falling back to system Chrome only when Chrome for Testing cannot be obtained. Other platforms keep the download-avoiding system Chrome preference.
Fixes#8673
Added Chromium no-startup-window to the broker-owned browser launch so no unowned foreground page survives session tab cleanup.
Covered the resolved Chromium argv and documented the Windows regression.
Fixes#8615
The executable version probe added in ecb22957 ("validate Linux browser
executables") replaced the file-only check in resolveSystemChromium with
isChromiumExecutable, which spawns the candidate `--version` for every
platform. On Windows chrome.exe is a GUI-subsystem binary: `--version`
does not print to a detached stdout and can hand off to a running
instance, opening/activating the user's normal browser window, after
which the probe rejects the candidate and falls back to cached Chrome
for Testing.
Gate the spawn probe on process.platform === "linux" (its intended
platform, where non-Chromium PATH wrappers are the real risk) and trust
the executable-file check on Windows and macOS.
Fixes#8445
Selected PUPPETEER_EXECUTABLE_PATH before probing system browser installations so compatible headless-shell binaries remain usable by the shared daemon.
Added an isolated Windows candidate-selection regression probe.
Fixes#7601
Add the executable names and absolute paths that are unique to Ungoogled
Chromium to the Linux branch of systemChromiumCandidates(), including the
system-wide and per-user Flatpak shims for
io.github.ungoogled_software.ungoogled_chromium.
The entries are appended after the existing ones, so a stock Chrome or
Chromium install still wins and PUPPETEER_EXECUTABLE_PATH keeps working
exactly as before.
Closes#7509
can1357