How to Install and Use Blur for Firefox (2026 Guide) As privacy concerns grow in 2026, protecting personal data while browsing is crucial. “Blur” (specifically known as Content Edit & Blur or similar CSS-based tools like Firefox-Mod-Blur) offers a way to manage privacy by blurring sensitive information on screen or customizing the browser’s interface.
This guide covers the two main ways to use “Blur” in Firefox as of mid-2026: using a browser extension for content privacy and utilizing CSS for a blurred interface look.
Method 1: Content Edit & Blur (For Protecting Sensitive Data)
This browser extension allows you to blur text or content on any webpage, which is ideal for taking screenshots or sharing your screen during meetings. 1. Installation
Open Firefox and navigate to the Add-ons website Content Edit & Blur on Firefox Add-ons. Click the Add to Firefox button. When prompted, click Add to authorize the permissions. 2. How to Use Click the Content Edit & Blur icon in your toolbar.
Click the extension icon to toggle between three modes: Idle, Edit, and Blur.
To Blur: Select the “Blur” mode. Click any element (text, image) once to blur it, twice for extra blur, and again to unblur. Method 2: Firefox-Mod-Blur (CSS Theme for Visual Style)
If you are looking to add a blurred, modern look to your Firefox UI (popular in 2026 for transparency effects), you can use the community-maintained Firefox-Mod-Blur CSS. 1. Installation
Open Profile Folder: Type about:support in your Firefox address bar, find the “Profile Folder” row, and click Open Folder.
Create Chrome Folder: Inside your profile folder, create a new folder named chrome (if it does not already exist).
Download Theme: Download the latest Firefox-Mod-Blur zip file from GitHub/datguypiko.
Install CSS: Copy the contents of the download into your chrome folder. 2. Configure Firefox for CSS For the blur effect to work, you must enable custom CSS: Type about:config in the address bar and press Enter.
Search for toolkit.legacyUserProfileCustomizations.stylesheets. Toggle it to True. Restart Firefox. Summary Table: Blur Types in 2026 Key Feature Content Edit & Blur Privacy/Screenshots Blurs text/images on webpages. Firefox-Mod-Blur UI Customization Adds blur effects to browser tabs/UI.
By implementing these, you can either protect your personal data or give your browser a sleek, updated appearance.
If you have a preferred type of blur (interface customization or content masking), tell me more about it so I can give you more specific steps.
datguypiko/Firefox-Mod-Blur: Firefox CSS Theme – For dark … – GitHub