Browsers

Rolling the Dice with CSS random()
Random functions in programming languages are amazing.
2025-08-21 19:02
What I learned when I stopped posting my life online, from a former influencer
This essay was originally published on The Sidebar, Mozilla’s Substack. I was an influencer years before it became mainstream in 2016. I shared my outfits on my fashion blog almost daily, along with recipes, travel itineraries, lifestyle photos, you ...
2025-08-21 17:39
Release Notes for Safari Technology Preview 226
Safari Technology Preview Release 226 is now available for download for macOS Tahoe and macOS Sequoia.
2025-08-21 00:21
Fast, private and secure (pick three): Introducing CRLite in Firefox
We are pleased to announce that Firefox 142 will begin production usage of our brand new certificate revocation system known as CRLite. CRLite makes your browsing faster, more private, and more secure, and is a significant advancement to the state of t...
2025-08-19 16:04
Firefox just got better for Chinese, Japanese and Korean speakers on Android
When Firefox users ask for better translation support, we make it happen. Thanks to your feedback on Mozilla Connect, Firefox now supports Chinese, Japanese, and Korean (often referred to as CJK) translation, both on desktop and Android. That means mil...
2025-08-18 20:54
Driving towards a double bottom line, through participation and choice
As global political landscapes shift, mission-driven organizations face a critical challenge: creating resilient models that deliver meaningful social impact and financial stability. For over 25 years, Mozilla has worked to strike this balance across d...
2025-08-13 20:04
A gentle introduction to anchor positioning
Anchor positioning allows you to place an element on the page based on where another element is.
2025-08-12 22:09
Who does Gen Z trust outside the algorithm?
This essay was originally published on The Sidebar, Mozilla’s Substack. When I started my newsletter, as seen on, a little over a year ago, it was because in the absence of early morning commutes, a designated office desk, and the water cooler conver...
2025-08-11 18:47
It doesn’t have to be like this — join Firefox in #DailyDefiance
Where has the default got us? Today, the default means sitting by while Big Tech and The Billionaires who run the industry shape every aspect of your life — who gets funding, who has access to your data and whose pockets get lined by the profits.  B...
2025-08-11 18:26
Item Flow – Part 2: next steps for Masonry
Back in March, we published Item Flow, Part 1: a new unified concept for layout, an article about a new idea for unifying flex-flow and grid-auto-flow into a single set of properties under a new item-flow shorthand.
2025-08-08 01:57
Release Notes for Safari Technology Preview 225
Safari Technology Preview Release 225 is now available for download for macOS Tahoe and macOS Sequoia.
2025-08-06 22:19
Anthony Enzor-DeMeo Promoted to General Manager, Firefox
Mozilla has promoted Anthony Enzor-DeMeo to General Manager of Firefox. Since joining Mozilla in December 2024, Anthony has played a pivotal role in evolving Firefox’s strategy and championing a user-first approach to product development. His leaders...
2025-07-31 14:46
Lightning performance, protecting PII: Taimi’s privacy-first TikTok campaign
For marketers, understanding how a campaign performed shouldn’t come at the cost of ceding proprietary data, or time-consuming integration acrobatics, with the platforms they run on. But that’s often the tradeoff they encounter, particularly when i...
2025-07-28 13:00
Release Notes for Safari Technology Preview 224
Safari Technology Preview Release 224 is now available for download for macOS Tahoe and macOS Sequoia.
2025-07-23 21:00
A first-party data reality check
Part I in Anonym’s Rewiring the Rules Series First-party data — the kind users share willingly with brands they trust — is a marketer’s most valuable and precious asset. But often, when it comes time to activate that data in the form of an adve...
2025-07-15 17:22
Let’s talk about data control
A new series exploring the connection between data protection and performance. The digital advertising industry is in a period of meaningful data use transition. An ecosystem that has fostered third-party cookies, device IDs, cross-site tracking, and m...
2025-07-15 17:19
How Firefox speaks your language, with help from volunteer localizers around the world
Before Firefox ever shows up on your screen in your language, from the menus to the messages to the welcome page, it passes through the hands of passionate volunteers around the world. Our volunteers are teachers, students, coders, creatives, and more....
2025-07-10 18:45
So many ranges, so little time: A cheatsheet of animation-ranges for your next scroll-driven animation
Background If you’re new to scroll-driven animations, welcome!
2025-07-09 23:25
Release Notes for Safari Technology Preview 223
Safari Technology Preview Release 223 is now available for download for macOS Tahoe and macOS Sequoia.
2025-07-09 21:30
Why we can’t stop multitasking
We’ve all been there: a notification pops up, and suddenly we’re responding — even if it completely derails our focus. It feels automatic, but it’s rarely just about the task at hand. As a staff product researcher on the Firefox mixed methods t...
2025-07-09 20:53