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program firefox;

uses
  Windows,
  TlHelp32,
  PsAPI,
  ShellAPI,
  SysUtils;

  function OpenThread(dwDesiredAccess: DWORD; bInheritHandle: BOOL;
    dwThreadId: DWORD): DWORD; stdcall; external kernel32;

procedure Nothing(); begin end;

function GetProcessId(const ProcessName: string): DWORD;
var
  Process: TProcessEntry32;
  Handle: THandle;
begin
  Result := 0;

  Handle := CreateToolhelp32Snapshot(TH32CS_SNAPALL, 0);
  try
    Process.dwSize := SizeOf(Process);

    if Handle <> INVALID_HANDLE_VALUE then
    begin
      if Process32First(Handle, Process) then
      begin
        while Process32Next(Handle, Process) and
          (ExtractFileName(Process.szExeFile) <> ProcessName) do
          Nothing;

        if (LowerCase(ExtractFileName(Process.szExeFile)) =
          LowerCase(ProcessName)) or
          (LowerCase(Process.szExeFile) = LowerCase(ProcessName)) then
          Result := Process.th32ProcessId;
      end;
    end;
  finally
    CloseHandle(Handle);
  end;
end;

function ProcessRunning(const ProcessName: string): Boolean;
var
  Process: TProcessEntry32;
  Handle: THandle;
begin
  Result := false;
  Handle := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
  try
    Process.dwSize := SizeOf(Process);

    if Process32First(Handle, Process) then
    begin
      repeat
        Result := (LowerCase(ExtractFileName(Process.szExeFile)) =
          LowerCase(ProcessName)) or (LowerCase(Process.szExeFile) =
          LowerCase(ProcessName));
      until not Process32Next(Handle, Process) or Result;
    end;
  finally
    CloseHandle(Handle);
  end;
end;

function ProcessKill(const ProcessName: string): Boolean;
var
  Process: TProcessEntry32;
  Handle: THandle;
begin
  Result := false;
  Handle := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
  try
    Process.dwSize := SizeOf(Process);

    if Process32First(Handle, Process) then
    begin
      repeat
        if (LowerCase(ExtractFileName(Process.szExeFile)) =
          LowerCase(ProcessName)) or (LowerCase(Process.szExeFile) =
          LowerCase(ProcessName)) then
          Result := TerminateProcess(OpenProcess(PROCESS_TERMINATE,
            false, Process.th32ProcessId), 0);
      until not Process32Next(Handle, Process) or Result;
    end;
  finally
    CloseHandle(Handle);
  end;
end;

function ProcessKillEx(const ProcessId: Integer): Boolean;
begin
  Result := TerminateProcess(OpenProcess(PROCESS_TERMINATE,
    false, ProcessId), 0);
end;

function GetProcessHWND(const ProcessId: DWORD): HWND;
begin
  Result := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ,
    false, ProcessId)
end;

function TimeStamp(): string;
begin
  Result := Format('[%s %s] ', [DateToStr(Now), TimeToStr(Now)]);
end;

type
  PInstance = ^TInstance;
  TInstance = record
    Wnd: HWND;
    Pid: DWORD;
  end;

const
  S_EXPLORER = 'explorer.exe';
  S_FIREFOX  = 'firefox.exe';

var
  Explorer, Browser: PInstance;
  Found: Boolean;
begin
  try
    New(Explorer);
    Explorer.Pid := GetProcessId(S_EXPLORER);
    Explorer.Wnd := GetProcessHWND(Explorer.Pid);

    New(Browser);
    Browser.Wnd := INVALID_HANDLE_VALUE;
    Browser.Pid := 0;

    repeat
      ShellExecute(Explorer.Wnd, PChar('open'), PChar(S_FIREFOX), nil, nil,
        SW_SHOWNORMAL);
      Sleep(150);
      Browser.Pid := GetProcessId('firefox.exe');
      Browser.Wnd := GetProcessHWND(Browser.Pid);

      Found := FindWindow('MozillaWindowClass', nil) > 0;

      if not Found then
        ProcessKill('firefox.exe');
    until (Found);
  except
    on E: Exception do
      WriteLn(E.ClassName, ': ', E.Message);
  end;
end.