Firefox browser, as a popular browser that focuses on privacy, has a rather unattractive default interface. This article will explore how to make your Firefox browser interface look better.

Themes#
There are many themes available in the Firefox browser extension store, and users can download and install these themes.
Link
Firefox Color Extension#
The Firefox Color extension is a browser extension produced by Firefox that can be used to modify and customize the colors of the browser.
Link
Customizing the Interface by Modifying Configuration Files#
The Firefox browser can achieve interface customization by modifying relevant configuration files.
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Access
about:configin the Firefox address bar, ignore the warning, and search fortoolkit.legacyUserProfileCustomizations.stylesheetsin the following interface, then set this item totrue.

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Access
about:supportin the Firefox address bar, selectProfile Folderat the bottom, and clickOpen Folder.

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The folder opened in the previous step is the root directory of the
Firefox Profile. Here, we need to create a folder namedchrome, and all subsequent custom styles need to be placed in this folder. -
Inside the chrome folder, create the two style definition files
userChrome.cssanduserContent.css, and customize them as needed.
userChrome.css is specifically used to customize the Firefox interface itself (such as Firefox's own "address bar, search bar, context menu, scrollbar...").
userContent.css is specifically used to customize the interface of websites visited by Firefox (including the new tab page, settings page, and other web pages).
- Those familiar with CSS can customize using CSS, while those who are not can download others' configuration files from https://firefoxcss-store.github.io/.
