21 December 2010 - 11:20#status 2010-12-20

– Brainstorm next Prospector experiments

At the Mozilla All Hands last week, and we held a discussion to brainstorm various ideas to try out in the Prospector family of experiments. A couple of the current experiments like Speak Words and Instant Preview help users get back to top sites almost instantly with just one key stroke, but these mainly help for the relatively small set of sites that users frequent and not so much the remainder of the history available in Firefox.

So the next set of experiments will focus on improving the experience of searching for pages in Firefox. Interesting findings from Query Stats could help identify relevant pages or help build a better view of your past browsing behavior. Additional data about each page could be tracked by Firefox such as unique phrases from the page or how long a tab was opened and interacted with.

Displaying the search results also received some attention as to how to add all this extra information in a clean way. Some ideas ranged from being more space efficient by showing location bar results on one line to taking up more vertical space as one might not need to use the page when searching. This led to ideas of using the whole tab content area to show rich results and provide interaction such as grouping/switching of types of results like pages, apps, videos, etc.

– Prepare search bar -> button demo

Along the lines of combining the location bar and the search bar, I’ve been hacking together a Prospector experiment that changes the search bar into a list of buttons. This allows for explicit control for the user to decide when searching should be local to Firefox’s history or over the web. It also makes it apparent that there are multiple search engines to choose from and clicking another button switches the current search request to another provider.

When clicking a button, it inserts a keyword and focuses the location bar, so it’s like doing a smart bookmark keyword search with the first location bar suggestion being the search. Combined with Instant Preview, it’ll automatically update the results immediately as you type more words or switch engines.

– Attend Open Web App discussions

I was curious what kind of web-apps were being created in general across the various web-app stores available today because I wanted to see if the search bar -> button experiment above could add to the types of available apps. This is because generally speaking, these search buttons processes some words from the user and converts it to a url or a set of results.

From the screenshot above, the last button is actually for Google Translate, so when I click the button and type “hola mis amigos”, Google translates it immediately as I type to “hello my friends“. This somewhat feels Ubiquity-like, which had all sorts of commands, so potentially allowing the web app manifest to describe these “searches” or “actions” could lead to web-apps that are more than just bookmarks.

– Push restartless code examples to GitHub

I’ve been hacking on restartless add-ons for a while now and noticed that I copy/paste some useful helper functions for when I start a new add-on. Other people hacking on these bootstrapped add-ons could make use of them as well, so I created a “restartless” repository on GitHub. I’ll write a post going into more detail later, but briefly, it’s a collection of git branches where each branch contains a helper function or provides an example usage or pattern.

– Tracking down flash crashes

I’ve been running into Flash crashes on OS X for a while and noticed other people were in a similar situation. So to help resolve it, I started tracking down the various flash crash reports, and I’ve posted about my findings and issues that I ran into.

6 Comments | Tags: Add-on, Conference, Development, Labs, Mozilla, Search, Status

8 April 2008 - 8:53Awesomeness in Beta 5

I’ve been busy preparing for a conference talk, so I didn’t get around to reporting AwesomeBar improvements for Beta 5 sooner. (But for those curious, I presented Branch-on-Random [pdf, uiuc.edu] at CGO 2008 [cgo.org] (Code Generation and Optimization). Basically, it’s an instruction that’s really cheap to implement and allows for a factor of 10 times less overhead than traditional sampling techniques. I think it went well, and I even got asked during Q&A.. “When can I buy one of these?” 🙂 )

As we’re winding down to ship Firefox 3, there aren’t as many more big features, but there’s still some useful changes in Beta 5 in terms of functionality, display, and performance. So those of you who have installed extensions to make the auto-complete smaller might want to turn it off to try out the new look.


To better accommodate people’s expectations of results in the auto-complete, there are frecency tweaks to better prefer pages you’ve typed — by default, before adaptive learning. This helps address concerns that the top level site’s main page should appear high in the list because typically people are typing in the domain.

Another common complaint is that results seemed to be returning useless results when typing 1-2 characters. This stemmed from results being matched in the middle of words instead of at the start of the domain, for example. The adaptive learning helps avoid this problem because you’re typing words and selecting results that matched the word you wanted. The learning system then knows to show that selected page over others when you just type a single letter of the word — effectively showing a result that matches at the beginning of the word.

So to improve things for Beta 5, words that you type in the location bar will try to match on word boundaries e.g., matching after a forward slash or space. This even works for CamelCase (capitalizing the first letter of words instead of putting spaces) which is common for wikis.

Word boundary matching

Searching for “wik m” matching on word boundaries


The first thing people will probably notice is that the list doesn’t feel as overpowering anymore. The number of results shown on the screen has been reduced to 6. Additionally the font size of the title text is smaller which felt unnecessarily large on some platforms like OS X. Ideally, the fewer number of results will help users scan results quickly instead of feeling overwhelmed. Combined with better functionality of multi-word search, adaptive learning, and word boundary matching, finding the page you want should be a happy experience. 🙂

Another set of changes is for how words you type get emphasized. Instead of only showing the first match in the title and url, it’ll emphasize all matches. Additionally, it’ll show matches when you type multiple words as well, so each word gets emphasized instead of nothing at all. For browser skin designers, there’s a new css class to alternatively emphasize matches, but the main purpose is to avoid styling bold which breaks common ligatures in some languages.

Emphasize islam

Bold/underline for english, just underline for ligatures


There has been improvements in browser responsiveness in Beta 5, so now it no longer eats up all of your CPU power for every letter that you type. In Beta 4, every single letter you typed caused the browser to start searching through your whole history

To optimize for users typing letters one by one for a whole word, we now reuse the results that are currently being shown in the list as well as continuing the search from where the last one left off. This has 2 main effects outside of reduced CPU usage: 1) existing matching results show up immediately instead of disappearing momentarily then reappearing and 2) not-as-frecently visited results can be found faster as you continue to type.

CPU Search Usage

CPU usage when searching in Beta 4 and Beta 5

The picture shows a CPU usage graph where high bars means the CPU is doing a lot of work (and potentially not letting it update the UI). The horizontal axis is time and each set of 5 bars shows the 5 seconds after typing a letter one by one. So comparing the two graphs, we find the same results with a lot less work.

As an informal poll, I was wondering how many people are using the unofficial tryserver builds that I’ve been making. There’s some features like showing keyword searches, restricting searches, etc., that might not make it into Firefox 3 final, but I could potentially start a build near ship time, so you can get Firefox 3 + some extra awesomeness.

15 Comments | Tags: AwesomeBar, Conference, Mozilla

13 June 2007 - 17:51Bye Bye San Diego!

Maybe I’ll be back here in 4 years for the next FCRC.. and perhaps with a paper submission! (Note to self: Don’t sign up for 2 conferences that are back to back that end/begin in the middle of the day. Apparently there’s no food for conferences ending today in the middle of the day, and no food for conferences starting in the middle of the day either..)

Time to head back to the commuter airport at SAN, which has the open ramp for boarding the smaller Embraer planes. (Watch out for passing planes that might cross your path while you’re out there 😉 it can get pretty noisy and windy..)

Convention Center

Outdoor dining area in front of the Convention Center

No Comments | Tags: Conference, San Diego

11 June 2007 - 23:24Banquet at the San Diego Zoo

It turns out that there was a trip to the San Diego Zoo after the first day of ISCA. I was slightly confused during the last couple presentations today when people kept asking when and where the buses were picking people up. Apparently the bigger conferences have fancy trips like these for a night of adventure and mingling.

After the shuttles brought us to the zoo, we switched over to the guided tour buses that would bring us to the dining area. And just as we pulled out of the boarding area.. a peacock!

Peacock Usher

Peacock sending us off on our merry way through the San Diego Zoo

The rest of the tour had quite a few animals showing up with an 80% attendance rate – perhaps the missing group were tired from the day and went to sleep already. (Hrmm.. sitting around and getting fed while people watch you could be a tough job..) So of the ones that did show up, there were all sorts of birds and boars to meerkats and antelope-like creatures. A note about the meerkats.. they have one of them standing guard to alert the rest, so you probably won’t see many of them – let alone the one that stands motionless blending into the area.

Meerkat.. maybe

There’s nothing here! ?

At the end of the journey, there were drinks and a ton of food (desserts too, but those disappeared quickly) for all the computer architecture people to sit down and chat. It was an interesting experience for me because I just joined while a lot of people have been around for many many years. I got to meet some people and hear what they’ve been doing in this field, so I could get up to speed and see where things are going. But I won’t go into all those details here – instead, I’ll fill the rest of this post with animal pictures. 🙂

Polar Bear Plunge

Is the polar bear thirsty or looking for a swim?
Elephant Snacking

The elephants were having dinner… right next to where we were having dinner
Squinting Koala

A fuzzy little koala (squinting causes the camera to blur ?!)
Flamingo Pond

A bunch of pink flamingos partying late at night

1 Comment | Tags: Conference, San Diego