Undoubtedly Firefox is the best one with lot of Mozilla addons and plug ins to choose the right mix of tools for an effective SEO strategy.....
According to the browser analysis and speed, work with fast website opening, i suggest you to use Google Chrome because it works so fast during the seo work when you need immediately open different websites for seo work.
Mozilla Firefox for the win. Its got a gazillion plugins for pretty much everything you ever need. Chrome is nice as well, the plugins are sweet and its fast. But I would still go for Firefox
Opera. Because I understand how user javascript works and Opera makes it extremely easy for me to scan website HTML, determine what I want to know, and move on.
Mozilla Firefox is the best of them all because of the number of tools it has got as Firebug, SEO Quake, Web Rank Toolbar and many others which you can use for SEO purposes all for free.
Chrome is the fastest , but lacks on addons Firefox has like SeoQuake, SEO Doctor, SenSEO, SEO Toolbar. In the end it`s a matter of personal preference.
Hi, i am using mozilla as well as Chrome this is my best browser, because I use this browsers with seo tool in which I received good site report from it....