Another instance of Firefox is already running... (FIX?)
"Another instance of Firefox is already running. Please close other instances of Firefox before launching Portable Firefox."
The "FirefoxPortable.ini" file has an entry to allow both "regular" and "portable" FF to run simultaniously, by changing the "AllowMultipleInstances=" to TRUE. This TRUE flag will create this annoying error message in FFP, if I already have a FFP open and try to open a new instance via a windows shortcut. It will complain, that an other firefox is already running, and I should close it first.
If I leave this flag the default "false", then the error is gone in FFP, but suddenly you can not open the regular FF (if FFP is open), because the same error will appear.