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8 Web Developer Must-Have Firefox Extensions

Firefox Extensions

This is what makes Mozilla Firefox special; the many extensions that help us in our daily tasks. For a Web Developer, the use of adequate tools can drastically reduce time-wasting and improve performance. Here I put together those tools that help me in my daily undertakings and that I consider the most essential of the many excellent Web Developer extensions out there. If you have tested better extensions then let us know in the comments. These are those I find most useful;

8) IE Tab – This is a Firefox extension that embeds Internet explorer in tabs of Firefox. It enables you to view web pages in Internet Explorer without having to open another window. For a web developer this means you can quickly see how IE displays your web site – we all know IE interprets some HTML tags differently from Firefox and other major browser.
You can configure this plugin to automatically open certain web pages that Firefox does not display correctly like the Windows Update page – thus you can also update Windows directly from this Firefox plugin. IE Tab also includes context menu integration.
The only draw back is that you need IE on your system to install it.



Foxmark – When you are not working on your computer maybe because you travelled or your pc is under repairs, one of the things you miss most is your bookmarks. With Formarks, you’ll always have your bookmarks at hand. Foxmarks bookmark synchronizer keeps your bookmarks on its server and adds the new ones to that list. So when ever you change pc, you just need to install it, get into your account and retrieve your precious bookmarks that every web master/developer or blogger can’t do without.



Web Developers – It is a very useful tool for web development. It has similar features to Firebug, but offers more tools to edit the web page you’re working on. You can modify cookies, examine them, delete and even manually add them. Web developer allows you to clear private data, enable/disable the cache – all on the fly. If you find it necessary, you can display all the image_paths on a page with a single click.
This add-on could be of importance to all those who browse the web, you could take-off images or background-images and more to facilitate reading or downloading of web pages.



Imacros – This add-on puts together many useful applications. It can be used to automate filling in forms, it offers a single doorway to many web sites using a single master password, extract data from a website and exports it to CSV files.
Most Web Developer’s use iMacros for functional, performance and testing of web their web sites and applications. I personally use it when I want to register to many different web sites. Also try Auto Fill to automate filling-out forms



ColorZilla – This a simple but brilliant tool for designers and developers. ColorZilla places an eyedropper icon in your the left hand-side of the status bar. When you click on it, you get a crosshair cursor. If you place this cursor over a web page, the values of the pixel under the crosshair will be displayed in the status bar – both as three separate values and as a hex value (e.g., R:255, G:255, B:255 | #FFFFFF).
Colorzilla also has an Online Palette Viewer and easy access to DOM Inspector Mozilla tool for examining a page’s Document Object Module.



MeasureIt – Useful and very easy to use. It places a small ruler icon at the left-side of your status bar. When click on the icon you get a crosshair cursor and your browsing page fades out. Move over to the desired area or object you want to measure and drag out a box over it – the width and height of the box would be displayed in pixels close to the box. With this tool you can measure the exact width of your sidebar, footer, header or whatever. To get out of MeasureIt, use the Escape key (Esc) and the page turns back to normal.



FireFTP is a Firefox add-on that turns your browser into a full-featured FTP client. FireFTP opens up in a new tab that offers a two-panel interface that permits you to browse and transfer files between the remote server and your local PC.
This FTP client is easy to use, so just try it out.
Its major draw back is that unfortunately it still does not support SFTP or SSH.



Firebug – This is probably the most important web development tool. This Firefox add-on allows you to browse and tweak HTML, CSS and JavaScript on a desired web page and preview the changes on the fly. It places an icon on the right-side of the status bar that informs you of errors in a web page. When you click on the icon it opens up a window that displays the line in which the error is found – this way it is easy to track errors on your web pages. In the Inspect mode hover with your mouse over a desired element and it will display all the codes that generate that element – much better than using the Page source that most browsers offer. It takes a whole page to write on FireFTP.


  1. Wexza
    11:25 pm on January 16th, 2008

    nice review even though I’m not a web developer. I use
    DownloadHelper to download videos
    and Gmail Manager

  2. Mika
    12:54 am on January 18th, 2008

    I can’t do without these three plugins:
    1) Interclue
    2) Greasemonkey
    3) Search Thresher

  3. Guy
    12:56 am on January 18th, 2008

    Nice list but badly ordered…
    Web Developer comes first and FireFTp second, the rest can come in any order.

  4. Suska
    12:58 am on January 18th, 2008

    I find MeasureIt the most useful and time saving, it measures everything

  5. MorganLighter
    2:07 am on January 19th, 2008

    Kabatology – Now you’re talking. Great post. As you may or may not know, I do a ‘Tool Time Friday’ post and would like to feature this piece on our site – Increase Your Website Traffic aka Free Traffic Tips.
    If you give me the go ahead to put your article on our site – it will appear next Friday, 1-25-08. Just drop me a line at the email address that you have and let me know. Later and Thanks!

  6. People
    7:38 pm on January 20th, 2008

    I’ve got over 8 firefox extensions from Personas to DownThemAll, StumbleUpon, AutoCopy….

  7. Fali
    7:30 am on June 29th, 2008

    Good Add-ons

  8. Jonathan
    10:45 pm on July 5th, 2008

    Really a Nice topic. Firebug is an essential one but it slows down firefox.As is IE Tab

  9. Den
    10:18 pm on September 25th, 2008

    Why does Firefox and Safari sometimes display certain websites badly? I.E. you cannot read teh type as it is in gibberish or code strange characters and fractions, etc.
    wikipedia does not display correctly on either browser..
    How can we fix this?

  10. Martin Kaba
    12:20 am on September 26th, 2008

    @DEN; I can’t say how if I don’t see the codes. Firefox anyway adheres to web-standards but IE does not, so it is easier to build web pages with FF than with IE