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When rapidly clicking links, macOS spawns multiple Firefox "remoting client" processes that each briefly show a dock icon before sending their URL to the running instance and exiting. Fix by setting LSUIElement=true in Info.plist (guarded by MOZ_ENTERPRISE) so no Enterprise Firefox process shows a dock icon at launch time. After the remoting check determines this is the main process (not a remoting client), the dock icon is restored via setActivationPolicy:Regular. Remoting clients exit before that point and never show a dock icon. Also guard the MOZ_FELT_UI LSEnvironment entry with MOZ_ENTERPRISE and pass MOZ_ENTERPRISE to the plist preprocessor via PLIST_EXTRA_FLAGS.
…con race Add test_rapid_new_windows_from_cli that launches 5 --new-window processes simultaneously, and test_rapid_new_tabs_from_cli that launches 5 -url processes simultaneously (tabs in existing window), to detect the race condition where rapid link clicks could spawn duplicate dock icons (see bug 2002462 comment 18).
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