Probably the best browser for SEO and Web Development (although prefer Chrome for surfing the net). This is mainly because of the wide variety of addons/plugins available.
Recommended Addons for SEO:
- Firebug
- Page Speed
- SEOQuake
- SEO For Firefox
- Google Toolbar (for page rank - doesn’t work on FF7+)
- Search Status
- SEOMoz Toolbar
- User Agent Switcher
If you have any other suggestions and I’ll add them to the list.