How to Change the Appearance of Orange Bar in Firefox

Firefox Logo

I love the way

Firefox can be customized

. I mean there is nothing in the browser that cannot be changed or modified according to a user’s requirement and comfort. While at the functional end

about:config preferences

can be tweaked to achieve almost anything, on the aesthetic front we have CSS components that can be defined to

modify the appearance of the interface


We will consider Firefox’s orange button that is placed of the top left of the browser and see how its look and feel can be amended. For example, check out the image (below) and note how I have changed the color from orange to red, the text from white to black and from Firefox to Guiding Tech. Interesting, right?

Firefox Customized Button

Here’s how you can make similar changes.

Steps to Customize Firefox Button’s Appearance

Each profile that you create on Firefox has a CSS file associated with it. It is meant for user inputs to vary the show of the browser. In the process we will also tell you how to find that file or create one if it does not exist.

Step 1: Open Firefox and navigate to Firefox (the orange button) -> Help -> Troubleshooting Information.

Firefox Troubleshooting Information

Step 2: A new tab will be launched. Look for the section reading Application Basics. To get to your profile folder click on Show Folder button. It is suggestive to open the profile folder from here because if there are multiple profiles you may not know which one is being used.

Firefox Show Folder

Step 3: In your profile directory you will find a folder called chrome. If you cannot find that, you may create one.

Firefox Profile Chrome Folder

Step 4: In this folder there should be a file named userChrome.css. The name should be exactly as spelled here.

Check Chrome File

Again, if you cannot find it you can create one. If it is there, go to Step 7. Else continue with Step 5.

Step 5: Right-click on and empty space and create a New -> Text Document. Once done, open the file with Notepad.

New Text Document

Step 6: Now go to File and Save As the document as userChrome.css. Make sure that you change the Save as type to All Files from the bottom of the Save dialog. Click on Save and close the document.

Save As User Chrome E1349804863273

Step 7: Open the userChrome.css file with Notepad. Simply right-click on the file and choose Open With -> Notepad.

Step 8: Copy the below code snippet (as-is) and append it to the file. Save the changes.

@namespace url(“”);
#appmenu-button {
background: #orange !important;
#appmenu-button dropmarker:before {
content: “Firefox” !important;
color: #FFFFFF !important;
#appmenu-button .button-text {
display: none !important;

Note the chunks in bold. They represent the button color, text and text color respectively. In order to change the appearance of the button you may modify these values. Here’s the code that corresponds to the image you saw in the beginning.

Firefox Chrome Css Code E1349804958201

If you do not have knowledge about Hex codes you may refer to this link. Or you may check this one.


This change is just a minor one. If you can master the codes you will be able to give a makeover to almost anything in Firefox. If you have some of those that you have been using for all these years, share with our readers and help in bringing smiles to the newbie Firefox users out there.

Last updated on 03 February, 2022

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