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Above version is incompatible with Sandboxie 5.33.2. Something about min version 73.0, max version 73.0. I have updated Sandboxie twice recently so this seems like a strange oversight.
Delete sandbox folder contents and try again. Or if you don't want to delete contents create a new sandbox and try there.
In reply to Pedro López:
Not sure Firefox had it's own sandbox, but I deleted the folder where it was located. I then told Sandboxie to run my browser sandboxed and that seemed to work. Thanks for the help, not sure why this happened as I have done Firefox updates before without issues.