The thing is, even with a RAM disk hosting the temp and TEMP directories, and even if I point Firefox at a distinct directory or folder on my (faster) D\ drive for caching stuff, FirefoxPortable will still write temporary files on the C\ drive, in Users\My_Name\AppData\Roaming\Mozilla I rename the default profile to Firefox, and change it's location to H\Firefox Also, this path is not relative, so I have to change IsRelative to 0 OK, so now we have the Firefox profile location sorted, we need to make sure that folder exists or Firefox will just overwrite our changes and make it's own folder in the default locationIn the Run box, type in %APPDATA% A Windows Explorer window will appear In this window, choose Mozilla → Firefox → Profiles Each folder in the "Profiles" folder (eg, "xxxxxxxxdefault") is a profile on your computer
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Appdata mozilla firefox profiles