In this guide, we will show you the steps to customize the Firefox browser using CSS. When it comes to privacy-enriched browsers, then the offering from Mozilla is the best in this domain. However, that isn’t the only domain where it shines, it is also known for beholding a slew of nifty customization tweaks up its sleeves, which you can carry out by making changes to the browser’s CSS files.
Apart from making changes to the user interface and experience, you can also add or remove features by making modifications to these files. Talking about “files”, there exist two of them- the userChrome.css and userContext.css. Let’s first understand about these files, and then we will make you aware of the steps to customize Firefox using these CSS files. Follow along.
Table of Contents
What is userChrome.css
userChrome.css affects the browser’s chrome (by chrome, we mean the user interface, not the browser from Google!). This includes things like the address bar and tabs, as well as the menus (including the context menu).
What is userContent.css
userContent.css affects the browser’s content, which includes the web content as well as Firefox built-in pages (about: pages), including the extension content. About pages include things like the new tab page (about:newtab), the options page (about:preferences), addons page (about:addons), among others. You can get hold of the complete list of about: pages at about:about.
How to Customize Firefox using CSS
- Type
about:configin the address bar and hit Enter. - Then click on the ‘Accept the Risk and Continue’ button.
- After that, search the below flag and toggle it to
true. toolkit.legacyUserProfileCustomizations.stylesheets
- Now, navigate to
about:supportin your address bar. - Then click on ‘Open Folder’ button next to ‘Profile’ folder.
- The profile folder will now be opened in the file manager.
- Create a new folder inside ‘profile’ and name it
chrome. - Inside the chrome folder, create two new files, namely:
userChrome.cssanduserContent.css- Open the desired file via Notepad and add the command
- Finally, save the changes via Ctrl+S, and restart browser.
That’s it. These were the steps to customize the Firefox browser using CSS. If you have any queries concerning the aforementioned steps, do let us know in the comments. We will get back to you with a solution as soon as possible.
