Cannot make FirefoxDE to run when modifying the executable & ini

I changed "firefox.exe" inside the App\Firefox64 to "firefoxde.exe" & at same time modified the launcher configuration file inside Other\Source, the FirefoxPortable.ini, I looked for the line: "FirefoxExecutable=firefox.exe" and modified it to "FirefoxExecutable=firefoxde.exe"

I'm aware some programs don't like to be renamed, but I believe it was around 2 days ago that I saw a post that was quite old and it was stated it was possible for Firefox, but I get the error by the launcher, which is not able to find the executable.