Mozilla Japan, Status updates, Web Animations

Gecko insiders

At Mozilla Japan, we’ve been doing a series of monthly events called “Gecko inside” where we discuss details of hacking on Gecko in the hope of helping each other learn and helping new contributors to get started.

Last weekend we held a special “write a patch” day where we gathered a group of long-time contributors to mentor first-time contributors through the process of setting up a build environment, writing a patch, and getting it reviewed and landed.


We fixed nearly a dozen bugs on the day and if you were hanging around on #developers about that time, you might have been surprised at the stream of Japanese names ticking by.

lots of Japanese commits

It was a fun event with veterans and first-time contributors alike asking if we could do it again.

Gecko internals

In keeping with the topic of new contributors, we were recently very pleased to have Ryo Motozawa join us for an internship during his university’s winter break. Ryo came to us with more curiosity than experience but quickly found his way around implementing WebIDL interfaces, animation timing features, and a number of DevTools features including exposing detailed animation performance information (due to land any day now!) using an interface Hiro recently built—all in just 2 months! Nice work Ryo!


(And, before you mention it, there’s already a bug to fix the text in that tooltip!)

Gecko geeks

Some of the other notable things we’ve been plugging away at here in Japan include:

Also, while far from a Japan-only effort, another animation-related feature I should mention is that thanks to platform work from Boris Chiou and Daisuke Akatsuka, and DevTools work from Patrick Brosset, the animation inspector now finally works with animations on pseudo-elements!


They’re just a few of the things we’re excited about at the moment. Oh, and this view!


Mozilla Japan

Mozilla Japan engineering is quite hot right now

Fortunately Taipei’s shaved ice extravaganza Ice Monster has popped-up just around the corner from our office in Tokyo!

Now that I’ve sufficiently buried the lede, I’d like to introduce you to what our platform engineers have been up to in the land of the rising (and scorching) sun.

Since April we’ve been trying to focus our efforts around two themes: Input and Animation although we also work on other items like fonts and supporting partner projects. Some of the things we’re tackling this quarter include:




Gecko guts

Makoto takes the floor to teach us the ins and outs of e10s in the first ever Gecko inside event

Last night we held our first “Gecko inside” meetup. The idea is for engineers to teach each other about different parts of our code and provide some useful information to people who are interested in contributing. This time, Makoto gave us a great overview of e10s in Firefox (slides).

We plan to do it again on September 8 including a special guest appearance from Gary Kwong presenting on fuzzing in Firefox!

If you’re in Tokyo please drop by! Better still, if you’re hacking on any of the same things, why not pay us an extended visit? In addition to Taiwanese shaved ice, we’ll gladly introduce you to some tasty sushi or barbecued beef tongue.