There has been several blogs that lists the best Firefox extensions that are out there. Since Pingdom are operating in the web performance and monitoring field we decided to make our own list of valuable Firefox extensions.

In this list we don’t cover the well known extensions such as Web Developer Toolbar and Firebug but rather focused on “lesser known” ones that can help development and testing. Extensions that deal with HTML, CSS, SEO and design were also ignored since other blogs have already made good lists of these kinds of tools.

Let’s get on to the list.

YSlow

YSlow has received great attention which is hardly a surprise since it’s such a good tool. It can analyze web sites and give you information about all requests that are made, load time, component sizes and also give you tips on how you can improve the speed of your web site. This extension requires that Firebug is installed.

Jiffy Firefox Extension

Jiffy is a new extension which gives a more detailed view of Javascript time measurements. You can get information of AJAX requests and other Javascript functions. The extension is based on Jiffy-Web Suite. This extension requires that Firebug is installed.

Firecookie

Using Firecookie you can view and manage cookies. It also has a console where you can see when cookies are created, changed or deleted. This extension requires that Firebug is installed.

Live HTTP Headers

Live HTTP Headers as the name says lets you view the headers sent by the web server. This can be useful when debugging web applications. It also lets you edit request headers and replay a request.

HttpFox

HttpFox monitors and analyzes all incoming and outgoing http traffic between the browser and the web server. It displays all request and response headers, sent and received cookies, querystring parameter, POST parameters and response body.

Poster

Poster is a tool for interacting with web services and other web resources and analyze the result. You can make HTTP requests and edit the body and content type and then inspect the result.

DNS Cache

This extension lets you easily disable and enable the DNS Cache in Firefox.

TestGen4Web

TestGen4Web is a tool that lets you record actions in Firefox to a XML file which can later be played back. The output can also be translated into formats so the recorded tests can be processed in other software as automated test scripts.

Selenium IDE

Selenium is a test tool for web applications where Selenium IDE is the recorder, much like TestGen4Web. It can record and playback actions and save the recordings as different scripts.

For more Firefox extensions for web development and design, see the following blogs:

• Top Best 50 Firefox Extensions for web design
• 10 Must Have Web Development Firefox Extensions
• 30+ Firefox Add-ons for Web Developers & Designers

Perl has been around since 1987 and became an early darling of web developers. These days, however, you don’t hear much about Perl. Everyone seems to be talking about trendier languages like PHP, Python and Ruby, with Perl left in the back as a neglected, not-so-hip cousin.

That might lead you to think that Perl is dying, but as it turns out, it’s still used by plenty of websites out there, including some pretty big hitters.

Here are some of the more popular sites that use Perl extensively today.

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In this post Twitter enthusiast Garin Kilpatrick shares his tips on effective ways to get more followers.

It is hard to put a price on a Twitter follower but the host of The Price is Right, Drew Carey, is offering to donate $1 to cancer research for every new follower he receives this year. The following eight tips will enable you to make the most out of your tweets and help you connect with as many followers as possible.

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Web design carries with it certain challenges that don’t exist in print design. Perhaps the most obvious is that in print design, whether you print your own work or have it printed by a professional, you know what your work is going to look like before your customer sees it.

Web designers don’t have this luxury. There’s always the chance that something, or maybe many things, won’t look or behave the same from browser to browser and from operating system to operating system. It’s easy to make mistakes that can make your website appear strange or annoying to a lot of website visitors.

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This April 1st the guys at Wired Magazine put together a great April Fools’ joke: A dedicated mobile device for Twitter dubbed the Wingman.

Check out this video introduction to the (then) totally fake device.

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Looking back on Android’s first year on the market, there’s no denying that things have been rocky for Google’s ambitious mobile platform. There was little hardware diversity for the better part of the year, and with the hype surrounding the release of the Palm Pre, Android seemed almost instantly dated. For all of its initial hype, the platform never really seemed like much of a threat to the iPhone, and in many ways it was barely competing. It seemed as if Android was going to celebrate its first birthday merely running on the fumes of excitement from its launch.

The announcement of the Motorola Droid’s upcoming release on Verizon’s formidable 3G network changed all of that.

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