10 Firefox Addons Every Web Designer Should Know

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There are thousands of Addons available for Firefox that let you save time and effort.If you are web designer you absolutely use firefox because of Firefox has some cool add-ons which make the job of website designers much easier and fast. We’ve selected 10 helpful add-ons for web designers hope it will benefit.

1.Window Resizer

The Browser Window Resizer is useful for testing different screen sizes. It accurately resizes your browser so you can test to see what a web page looks like in all of the standard resolution sizes.
Supports the 640×480, 800×600, 1024×768, 1280×800, 1280×1024, 1600×1200 resolutions.
Resize the current page via the Context menu, Tool menu or Toolbar button.

2.Style Sheet Chooser

Style Sheet Chooser II allows you to choose author-provided alternate style sheets for a web site, and have those choices be persisted for all pages on the same site. Style Sheet Chooser II replaces Firefox’s built-in style sheet switcher

3.GridFox – The Grid Layout Firefox Extension

GridFox is a Firefox extension that overlays a grid on any website. If you can open it in Firefox, you can put a grid on top of it. It’s easy to customize, allowing you to create the exact grid you designed your layout around.

4.Html Validator

HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon in the status bar when browsing.


It will capture what you can see in the window, the entire page, just a selection, a particular frame… basically it saves webpages as images – either to a file, or to the clipboard.


Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.

7.Image Zoom

Easily zoom in, zoom out, fit image to screen or set custom zoom on individual images within a web page. All this can be done by using the context menu or a combination of mouse buttons and scroll wheel. Handy to see the finer details of smaller pics or to make very large pics fit within your screen.


Add CSSViewer in your toolbar to use it.

9.CSS validator

Validates a page using the W3C CSS Validator. Adds an option to the right-click context menu and to the Tools menu to allow for easy validation of the CSS of the current page. Opens the results in a new tab. Will only work on pages that have a CSS file associated.


With ColorZilla you can get a color reading from any point in your browser, quickly adjust this color and paste it into another program. You can Zoom the page you are viewing and measure distances between any two points on the page. The built-in palette browser allows choosing colors from pre-defined color sets and saving the most used colors in custom palettes.

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[…] 10 Firefox Addons Every Web Designer Should Know […]

10 years ago

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10 years ago

I liked web developper, is very good too.
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Box 9
10 years ago

Thanks for the list, there are a couple there that I need to check out.

China Electronics
10 years ago

thanks for sharing, awesome Firefox Addons,Firebug is my best i like!

medikal çeviri
9 years ago

Thanks for posting. Every web designer will find something useful here.

9 years ago

Hi, a lot of these tools exist into Webdeveloper Toolbar – it has almost everything you need. Combined with Colorzilla and Firebug it will offer you anything you need to start working.

El Boletaire
9 years ago

Hey, there is another plugin very usefull for designers:



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