windows - Batch file to open multiple tabs in different time in firefox already opened

I use portable firefox 60esr. until yesterday I could with a batch file to open in the same firefox open several tabs with a delay, but from today if I reopen firefox with batch file I appear a warning that firefox is already open and requires closure.

Before yesterday instead with a batch file I started several times firefox and in the same open firefox were opened new tabs what depends this warning that prevents me with a batch file to open new tabs with open firefox ?

This is batch file used

:: 'Firefox Tab 1'
START /B "" "D:\Programmi Installati\Firefox Portable ESR Quantum 1\FirefoxPortable.exe"
ping -n 10 localhost >nul 2>&1
:: 'Firefox Tab 1'
START /B "" "D:\Programmi Installati\Firefox Portable ESR Quantum 1\FirefoxPortable.exe"
ping -n 10 localhost >nul 2>&1
:: 'Firefox Tab 1'
START /B "" "D:\Programmi Installati\Firefox Portable ESR Quantum 1\FirefoxPortable.exe"
ping -n 10 localhost >nul 2>&1

This batch file opened firefox and then gradually opened 3 tabs with a delay by loading the default page of firefox.

Why does this batch file no longer work from today ?

I used this batch file to open firefox and after a gradually started I opened the new tabs.

Answer

Solved deleting firefox and reinstalled it now works and i can execute the batch file added.