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How To Easily Edit Your WordPress Theme Design With The Firebug Firefox Addon

Firebug for FirefoxAs bloggers, we aim to provide unique user experiences for all our visitors online through the use of the best blog designs and templates we can find. Although there are thousands of free and premium themes available, there comes a time when we want something specifically suited to our taste as well as our readers’ without hiring a developer.

The ability to customize your own blog theme is an invaluable skill and will save you lots of time and money in the long-run; and through the use of a tool like the Firebug Firefox Add-on, making simple and advanced customizations are easier than ever. Firebug is a tool I use extensively as a developer to help me understand a site’s layout and quickly implement design changes through CSS. So here are some tips and ideas to get you started on customizing your own WordPress themes.

Firebug’s Features

Firebug provides the most common features for almost every customization you can think of. While you browse you can edit, debug and monitor your CSS code and tweak styles to see what they would look like before you implement. Firebug basically allows you to:

  • Tweak and position HTML elements with CSS and the Layout panels.
  • Find specific elements on a webpage with ease and precision.
  • Monitor the performance of each file to identify slow loaders
  • Visualize CSS Metrics
  • Plus a host of additional features

To download this neat tool and find more details regarding its powerful features, visit

Identifying & Editing CSS Properties & Values

For WordPress blog theme users with Firebug installed, customization is a breeze regardless of who designed the template and how. Once Firebug is installed a small icon will be available in your web browser that gives you access to it’s panel as shown below.

In the image above, the left panel shows the HTML that controls the site’s layout and on the right we have its CSS. Usually WordPress themes’ CSS are editable through the style.css file which is found in your theme’s directory.

Common Challenge Overcome

Trying to figure out what each selector and property represents can be an impossible task especially if the developer of the theme does not provide comments and descriptions within the code. To overcome this, Firebug allows you to select page elements, using its element inspector, to find out its HTML code as well as the CSS selectors and properties that control the elements.

Once you have found the selectors you want to edit, simply access your style.css file through the WordPress dashboard Appearance >> Editor option and use your browser’s search feature to find the code.

Learning to edit and tweak your CSS within the theme’s stylesheet file is the first step to creating a unique theme for your blog even if its from a free design.

Additional Resource

To gain more insight into the power of CSS and learn all the possibilities that exist in design, check out the CSS section of the codex – They have many references to W3Schools, which is where I learned most of my CSS. W3Schools provides all the information you will need to learn CSS from the basics to advanced.


Not all of us as bloggers are interested in becoming developers but think of CSS as a tool to control the layout, colors and feel of your blog’s theme as you would think of customizing a Microsoft Word document. It can be a very fulfilling feeling to know that you can make your blog stand out by simply implementing some very basic code. So CSS is definitely worth learning a bit.

Firebug is the simplest tool I have found so far for gaining control and understanding a WordPress blog theme design and is very useful for getting started as a new blogger and editing your theme.

Are there any other tools you have tried that offer comparable features and capabilities that  have helped you to master your blog’s design? Please share them with us in the comments below, we would love to hear of your experiences.

Categories: Blog Design, WordPress Tutorials
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  1. Kissie ) says: 8/2/2010

    I stopped using Firefox a while ago, I wonder if there is a Chrome Extension that does the same. Do you prefer Firefox over Google Chrome? Thanks.

    • Robyn from Sam's Web Guide ) says: 8/2/2010

      Hello Kissie,

      Thanks for commenting. I’m still trying to decide which is better for me. I particularly like chrome because it seems to load pages faster than firefox but I just can’t seem to switch from the fox :) I’ve heard of security issues with chrome but overall its a great browser.

      You can download Firebug Lite for chrome at

  2. Kissie ) says: 8/2/2010

    It’s installing now! Thanks.

  3. Dev - ) says: 8/3/2010

    Hey Royn,

    Glad to see you back.

    Really Great Post. I’m already using firbug, but never though of doing this.

    Thanks for sharing this great Post.


  4. Dean Saliba ) says: 8/3/2010

    Not really something that could help me but I know there are a lot of users who would love this add-on, including my brother.

  5. Blog Angel a.k.a. Joella ) says: 8/3/2010

    I make extensive use of css for changing and tweaking my WordPress layout. I use a free theme framework from and have been blessed with their awesome tutorials and forums.

    I have never tried firebug, but I think I might give it a go. Maybe it will save me some time in future theme tweaks. Thanks for sharing these tips and resources. It’s refreshing when a post is this useful.

    • Techyogi ) says: 9/17/2010

      I am using firebug from a long time.You can also check and validated your javascript codes along wiht css of page.

      @Blog Angel a.k.a. Joella – Is there any framework like for blogger platform as well ?

  6. Senne Vaeyens ) says: 8/4/2010

    I tend to use Stylizer in stead of firebug, especially less technical people will benefit more from the user-friendly interface. Big disadvantage is that it’s not free…

  7. eben says: 8/29/2010

    you can use firebug for ie if you use internet explorer

  8. Senne Vaeyens ) says: 8/29/2010

    I just noticed that google chrome has this finctionality built in…

  9. termal jel says: 9/24/2010

    kullanımı kolay olsa gerkli teşekkürler