Mozilla Blog

Reporting a bug on a fragile analysis

Mozilla and Google Sign New Agreement for Default Search in Firefox

We’re pleased to announce that we have negotiated a significant and mutually beneficial revenue agreement with Google. This new agreement extends our lon

MemShrink progress report, week 23

The only significant MemShrink-related change that landed this week was that David Anderson removed TraceMonkey , the tracing JIT compiler. In fact, TraceMonkey was disabled a while ago, so the effects on code size and memory consumption of its removal have been felt since then. But it feels more real now that the…

Mozilla launched popcorn.js

Today is a big day for Mozilla and web video. Popcorn, Mozilla’s new HTML5 media toolkit, just launched version 1.0. Coinciding with the launch is

DigiNotar root CA trust removal follow-up

Earlier this week we revoked our trust in the DigiNotar certificate authority from all Mozilla software. This is not a temporary suspension, it is a complete removal from our trusted ...

Mozilla to Certificate Authorities: no subordinate CAs for traffic interception

Earlier today we sent an email to all certificate authorities in the Mozilla root program to clarify our expectations around certificate issuance. In particular, we made it clear that the ...

Mozilla Launches Firefox 4 for Android

Mozilla, a global, nonprofit organization dedicated to making the Web better, is excited to release Mozilla Firefox 4 for Android. Firefox delivers an intu

Dead Code Elimination for Beginners

Pdf.js reached its first milestone

Faster JavaScript parsing

Over the past year or so I’ve almost doubled the speed of SpiderMonkey’s JavaScript parser. I did this by speeding up both the scanner ( bug 564369 , bug 584595 , bug 588648 , bug 639420 , bug 645598 ) and the parser ( bug 637549 ). I used patch stacks in several of those bugs, and so in those six bugs I actually…

SpiderMonkey is on a diet

One thing I’ve learnt while working for Mozilla is that a web browser can be characterized as a JavaScript execution environment that happens to have some multimedia capabilities. In particular, if you look at Firefox’s about:memory page, the JS engine is very often the component responsible for consuming the most…

Firefox 4 RC now available

Mozilla Firefox 4 for Windows, Mac and Linux has exited the beta cycle and is now available as a release candidate in more than 70 languages. The millions

Old Dijkstra Essays Considered

Results of Mozilla's SOPA blackout

Yesterday, we blacked out the default start page in Firefox and redirected visitors to the Mozilla sites to a special action page. We also sent direct mess

[Firefox] Jägermonkey: it’s in ur browser

Mozilla JavaScript 2011

Why Tabs are on Top in Firefox 4

Mozilla Open Web App prototype

The open Web is a great platform for rich applications. It would be even better if it had additional capabilities to ease discovery, acquisition, installat

Faster Firefox landing page increases download conversion by 15%

Let's start with the punchline: By making a few minor tweaks to our top landing pages, we can drive an additional 60,000,000 Firefox downloads per ...

Why Ad Blockers Work

Why People Don’t Install Firefox - Part III

In Part I we discussed a framework around understanding the Firefox user experience at the moment a person installs Firefox. In Part II we walked ...