[Closed] Firefox Portable 69 stopped opening links from external apps

Hello to all, launching
"FirefoxPortable.exe www.google.com"
or
"FirefoxPortable.exe -url www.google.com"
used to work well, but for the last version of FF it started to output a message:
"Another instance of Firefox is already running. Please close other instances of Firefox before launching Mozilla Firefox, Portable Edition."

Opening links form other apps seems impossible now (since we all know that running just non-portable "firefox.exe www.google.com" results in another instance of Firefox, but without the profile).

Am I doing something wrong or has there been any breaking change?

Thanks!