20 Firefox Addons that Every Webmaster Needs to Have

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Firefox has long garnered the support of webmasters everywhere. Using free addons, Firefox can quickly become a powerful tool for website design and validation, keyword research, niche research, competition research, PPC research, and much more.

Webmasters have long been in love with Firefox. With the seemingly infinite number addons available, it is easily the most functional browser available. With so many different addons to choose from, it is imperative that you limit yourself to only the most important. Unfortunately, with so many choices, this can seem like a daunting task.

Here are my 20 Must Have Firefox Addons for Webmasters:

1. Firebug

Firebug is one of the most well known Firefox addons for web developers. It offers a variety of development tools all in one place. You can edit, debug, and monitor HTML, CSS, and even JavaScript. Many developers would argue that Firebug is one of the most complete addons available. If you are only to have a few addons, then Firebug is a must.

2. Web Developer

Web Developer offers a variety of different web developer tools all in one place. One of the best aspects of web developer is that you can see how your CSS would alter your webpage in real time without actually modifying your CSS.

3. Greasemonkey

Greasemonkey allows you to customize your webpages by inserting tiny pieces of JavaScript. While there were initially some problems with the most recent version of Firefox, this addon is updated frequently.

4. Page Speed

Page Speed is a tiny addon that helps you to track the performance of your web pages as well as offering common suggestions for improvement. It runs several different tests based upon current best practices to track and enhance your pages performance.

5. Yslow

Yslow is another addon that analyzes your web pages and suggests improvements that could enhance your sites performance. It can be easily integrated with Firebug, and provides a wealth of data. It can offer suggestions, summarize page components, display page stats, and provides access to additional tools for performance analysis such as Smush.it and JSLint.

6. User Agent Switcher

User Agent Switcher adds an additional menu and toolbar which allows you to switch the user agent of your browser. It is commonly used for websites that for some reason are not compatible with Firefox. There are additional uses as well, especially with mobile websites.

7. CSS Validator

The CSS Validator addon validates web pages using the W3C Validator. It is important to note that this addon will only work with pages that have a CSS file attached to it. The results will then be opened in another tab.

8. HTML Validator

The HTML Validator addon is based on Tidy and OpenSP. It can validate the HTML sent by the server or the HTML in the memory after the AJAX execution.

9. Live HTTP Headers

Live HTTP Headers has proven to be a great tool during the debugging process. It allows webmasters to view the HTTP headers of a page as well as other pages while you are browsing.

10. FireFTP

The FireFTP addon was designed to offer webmasters an easy, secure, cross-platform FTP client. In addition to file transfers, this addon also hosts more advanced features such as syncing directories, SSL encryption, remote editing, drag and drop, and much more.

11. DOM Inspector

DOM Inspector was designed to help webmasters inspect and edit the live DOM of any web based document and XUL application. It utilizes a two-paned window which offers unique views of the document and the nodes that are within it.

12. SEOBook's SEO for Firefox

SEOBooks's SEO for Firefox addon provides a large number of important pieces of data that makes your SEO research much easier. It works with both Yahoo and Google search results pages. You will get to see things such as: PageRank, Domain Age, Links, del.icio.us links, Technorati links, and much more.

13. SEOQuake

SEOQuake was designed to help webmasters that utilize SEO and free internet promotion for their websites. SEOQuake gives you instant access to several critical SEO parameters. SEOQuake has two separate parts: the SEOBar and Inclusion of Parameters in SERP's. If you are doing SEO research, SEOQuake can make your data collection much easier.

14. SearchStatus

The SearchStatus addon is another SEO focused tool. It displays the Google PR, Compete Rank, and SEOmoz in your browser. It also can quickly calculate keyword density, highlight keywords, and much more.

15. Xray

Xray allows you to see how the web page is constructed without need to flip back and forth between the page and the source-code The source-code is displayed to the side of the page to make viewing everything easier.

16. Webmaster SAPE

The Webmaster SAPE addon was designed to help webmasters extend their abilities and optimizers while they are working within the SAPE interface as well as the Uniplace exchange.

17. RankChecker

The RankChecker addon is another SEOBook tool. This tool is lightweight and easy to use, while still providing the same data that professional SEO firms use to optimize websites. It is used to check your website keyword by keyword so that you can always track how well your website is ranking in the SERPs.

18. Site Information Tool

The Site Information Tool Firefox addon was designed to instantly give you information about any URL. This includes: ranking information, IP address information, Linking information, Page Information, Feed Subscriber Counts, Top Performing Keywords, and much more.

19. Keyword Spy SEO/PPC Plugin

Keyword Spy - The goal of this addon is to help with PPC and SEO research. There are 3 functional parts to this tool: the Keyword Spy Status Bar, Attribute Bar, and the PPC Keyword Research. The Status Bar gives basic information instantly such as PR and Alexa Rank. The Attribute Bar provides data about every URL in the search results from the major search engines. Finally, the PPC Keyword Research tool reveals the keywords that each site uses in their PPC campaigns. The keywords are then gauged by metrics such as ROI, number of competitors, click per day, cost per click, and position.

20. Google Global

Google Global - This simple addon is used to help you see what the Google search results look like when viewing them from different geographical locations. This is especially important if you are trying to advertise to multiple locations or local locations.

These are my top 20 most useful Firefox plugins for webmasters. With so many addons available, I am sure that there are more that could have made this list. Are there any additional addons that you find useful on a regular basis?

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Anonymous (not verified):

I happen to love the NEW

I happen to love the NEW Google Chrome killer nice browser BUT I still use Firefox alot too

Nathan:

MeasureIt ff addon

one of the addons that i often use and is not on this list is this tiny addon: MeasureIt. I lets you select part of a page with ruler to find out dimension in pixels. Very useful it can be.

Anonymous (not verified):

Seo doctor

I found this excellent ff addon for seo purposes:
https://addons.mozilla.org/en-US/firefox/addon/102178

It is more than excellent. Definitely a "must have" addon.

justme (not verified):

excellent collection

This is excellent collection. I use some of them already, those widely popular like firebug, page speed and validators. Now I might try google global and keyword spy, they seem promising and interesting. there is so much good ff plugins, but is not good to use a lot of them because ff gets raelly slow then. especially with heavy ones like firebug and greasemonkey.

Anonymous (not verified):

I also use this usefull one :

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