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Yes, I know there are much more great FireFox plugins but I am sharing only those I am using myself and find really useful.
Before I start, here is an overview of what I am going to talk about:
SEOQuake Any page instant SEO analysis
SearchStatus Google, Alexa, Compete Rank Toolbar
Google toolbar Google search and suggestions
Rank Checker button Instantly checks a site SE rankings
User Agent Switcher Change the user agent
SEO for FireFox Exhaustive SEO analysis within search results
Compete.com Site traffic information
Web Developer Instant access to image and link information
Page Age Get the page age
9 SEO FireFox Plugins I Can’t Live Without
