@echo off
@chcp 866 > nul

cd /d "%~dp0"
if not exist firefox.exe goto :err

rem -------- сюда впиши путь к нужному профилю. К папке с нужным профилем. Обычно где-то в недрах %APPDATA% . Если старый - иди самую бОльшую по размеру
rem -------- что-то типа такого:

set PROF=%APPDATA%\Mozilla\Firefox\Profiles\kzkc6wpd.default\

rem -----------------------------------------------------------------------------------

rem для запуска другой версии окна с еще другим-каким профилем, нужно добавить -no-remote вначале
rem обычно оно не  нужно и если профиль один, то лучше убрать.

start "" /D "%~dp0" "firefox.exe" -no-remote -profile "%PROF%"
exit


:err
echo ································································································
echo ································································································
echo .
echo  В этой папке, рядом со скриптом, нету firefox.exe Выхожу.
echo .
echo ································································································
echo ································································································
pause
exit