I prefer Chrome for most tasks but there are times when Firefox is the right tool for the job.
- Accessing a port on a local machine e.g. for CUPS admin or 3ware admin. AFAICT Chrome cannot do this.
- Certain aspects of Webex.
- Proxy settings are settable in Firefox whereas in Chrome they just default to the system settings.
For general purpose browsing for my taste Chrome is faster, renders pages more pleasantly and accurately and probably works better for the Googleverse suite of apps.