"another instance of firefox is already running" problem
Here we go again...
After running Firefox_Portable_1.5.0.7_en-us.exe inside the folder 'D:\FP' and then running FirefoxPortable.exe inside the folder 'D:\FP\FirefoxPortable' I recieve the infamous "Another instance of Firefox is already running. Please close other instances of Firefox before launching Firefox Portable." error.
Needless to say, I did a search for 'another instance' in the Forum and remain at a loss as to how to correct this.
https://portableapps.com/search/node/%22another+instance%22
Some of the forum posts are silly like "don't change the name from Portablefirefox.exe to firefox.exe". Others downright stupid "Just restart the computer, it could be a extension running?". This one is almost criminal "put the .ini file in the same folder as the PortableFirefox.exe"