Mozilla Firefox is by far one of the most preferred browsers on the planet at this point, especially within the development community as it has tons of add-ons that will blow your mind. Once again, the open-source community shines through with a huge community behind these addons, and some see hundreds of thousands of downloads per day. If Firefox isn't the most popular browser right now, within 10 years it probably will.

One of the greatest features of Firefox are the many great Firefox addons available for it. There are thousands to choose from, but there are some that are just about essential to having a great experience online, espeically with all the malicious ads out there these days. Here is a list of great Firefox Addons that will bring joy to your day.

Security Firefox Addons

Adblock Plus - Advanced Adblocking features including enable / disable features per website.

Developer Firefox Addons

Colorzilla - Advanced Eyedropper, Colorpicker, Page Zoomer, and other colorful goodies.

Element Properties - Returns the 'Properties' menu item that was removed in Firefox 3.6 to the context menu.

Firebug - Advanced web development tool with HTML & CSS editing on the fly along with error testing features.

MeasureIt - Draw out a ruler to get the pixel dimensions width and height of any elements on a webpage.

SEO Firefox Addons

SEO Status PageRank/Alexa Toolbar - A simple way for web developers to see the results of their SEO efforts.

Useful Firefox Addons

Delicious Bookmarks - Access your bookmarks whever you go and keep them organized no matter how many you have.