The list of Firefox addons never burn out. The more you have the better. Even though I use a lot of plugins and addons, I never wrote about them. Here, I share with you the entire list of Firefox addons that I use and some really useful ones for webmasters and SEO’s. Given along with is their descriptions and uses so that you don’t have to install them just because they are available.
If you’re a web master, you most probably would be using this already. Its the most popular one for webmasters. Web Developer toolbar has all the tools that a designer would require to test the design and layout of a webpage. It analyzes styles, enables you to view the site without images, shows the layout format, outlines tables / forms etc, validates the code and a lot more. The swiss army knife for web masters that it is.
I use it mostly for validating code, CSS tweaking and planning layout.
This tool comes from Aaron Wall’s SEO Book stable. A one click solution for finding all the SEO data about websites, this comes in handy while creating reports or just when you’re digging information about websites. The only glitch with this extension is that if you’re using it extensively, you may run out of API’s (or so I’m told) that you don’t get the information you’re looking for. Use it optimally, and its the best one out there.
This addon is one that I use very often. It lets you switch / view the current page as in a different browser (IE, Opera, NetScape). Comes in handy when you want to check for Cross Browser Compatibility issues. Very effective tool.
This addon enhances your Google search by giving you more options like search by date (past 24 hours, by week, by month etc), filter by language, search for any file (mp3, doc etc). Pretty effective if you want to save time filtering through results manually.
There’s a lot of data to be dugg and we never have enough time. This addon helps you save time by digging all the SEO metric data in a few clicks.
This addon, helps you search Google using the different country specific domains for a single search term. Its technically supposed to be excellent, but fails to work some time, but quite handy and easy to work with, especially when you have lot of keywords to search for and lot of SERPs data to collect.
An excellent plugin, it searches for used keywords on a particular page and shows the keyword density count for each keyword used on the page on a sidebar. Very useful when analyzing pages for on-site SEO metrics.
For the Yahoo fans, this one makes checking the Yahoo Site Explorer results quick and easy.
Bloggers should always be ready for a screen grab, and Fireshot takes screengrabbing to another level with more functions that helps bloggers. Like adding text, pointers, highlighting etc, you just need to upload the image to your blog, it takes care of all the basic image editing functions.
This is a cute powerful addon (hugely popular as well) that will help you pick the HTML color code by just pointing at any element on the browser. I use it very often while tweaking the colors of my AdSense ads and matching them with the theme colors.

Another Google enhancement addon, this one adds a thumbnail preview of the website right in your SERPs, so that you can recognize the site if you’ve recently visited or you can avoid sites that you know of low trust value.
This addon is again a popular one, it shows the alexa rank /traffic details of the current website on the browser. Very good for quick references. You can see the graph and make out the site’s general popularity.
Another nifty addon that will help you find similar or related topics to the current search on Google. Useful when you’re researching on keywords.

Very handy addon. It reveals the IP address of the current page at the status bar and does a lot more with it like IP tracking, Who is lookup etc on right click.
Another nifty addon that helps you find everything about a domain. The IP, other sites hosted on the IP, Server type, the country where its hosted (shows by the country flag) and a whole lot. I use it very often and comes in handy when investigating on site health and other SEO metrics.

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Well great tool but most of them were used by every seo webmaster. There is nothing new. May you find something new in future.
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Great list. I especially love the SEO for Firefox that Aaron Wall created!
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great list Mani but you miss this useful addon called seoquake: https://addons.mozilla.org/en-US/firefox/addon/3036
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Mani Karthik
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Hi Tania, I had mentioned about it exclusively here once
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Very useful plugins. I was searching for a long time for such adons.
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[...] Cambronero: En Daily SEO Blog: 15 Useful Firefox addons for SEOs and WebMasters. [...]
That’s a good list. The only one that was new to me was KGen. I’ll be checking that out.
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Fantastic … just love in it…keep posting kind of stuff!
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Nice! I´ll try some of them.
I think number 2 could help me a lot.
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Great list
but addons make me slowly
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Thanks for introducing K Gen tool.
Hope it helps me during site analysis.
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Great plugins! Thanks
~ Butch Decossas
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Great list really useful
Thanks
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thanks for info.
its useful for everyone who became webmasters
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Great
I looking addons check dofollow link ?
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Oh my god, Its a great list, I was only used nodofollow plugin lol. I found “SEO for FireFox ” usefull for me. Thanks Karthik
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[...] are tons of free SEO addons available for Firefox already, and I’ve covered them here as well, but these are some of my recent finds and quite honestly they are powerful and a must to [...]
15 Useful Firefox addons for SEOs and WebMasters http://bit.ly/11pATC
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[...] rely much on tools, they haven’t been consistent, although there are some powerful SEO addons to firefox, which do a neat [...]
prashanth: 15 Useful Firefox addons for SEOs and WebMasters http://bit.ly/11pATC: prashanth’s status on Wednesda.. http://bit.ly/sVfrO
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Nice tools. But still wish to have some advanced tools, that help with link building for example.
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ya friend i agree with you that these plugins are really essentials for SEO. Thanks for lovely info
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