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Web App Developer Initiative

In 2015, Mozilla launched an initiative to energize web app development. The initiative invites the participation of browser makers, web frameworks, cloud service providers, and content providers. What unites all these disparate parties is a belief in the power of web apps that work reliably with bad networks, reengage users with notifications, and can be installed like native apps. We believe developers will use these technologies to deliver experiences that will redefine the role of the web.

In the short term, we are focused on the combination of several API's -- service workers, web push, and the W3C web app manifest.



WADI is the work of many hands across Mozilla in many different groups. Among those spending most of their time on WADI are Thomas Elin, Program Manager; Harald Kirschner, Engineering Manager; Myk Melez, Software Architect; Bill Walker, Senior Manager. Engineers in Harald's team working on WADI include David Walsh, Brendan Dahl, Piotr Zalewa, Marco Castelluccio, Tim Abraldes, and Salvador de la Puente González.

Find us on IRC

Mailing Lists

  • - Broader opt-in list for those interested in regular WADI updates.
  • - Internal WADI members. Used for brainstorming and general conversation.

Reading List

  • Paul Kinlin, "Living with Web Apps"
    • In this post, Paul gives an hour-by-hour journal of a day using only web content on his smartphone. Along the way he offers a list of "ten deadly sins of a mobile web app" along with other reflections on his experience.



Ship v1 of Oghliner, a library/tool to offline web apps using Service Workers and deploy them to GitHub Pages. We will base this on top of several existing open source projects, including sw-precache from the Chrome team (


Ship MVP of at least one serious offline/progressive web app. We need to explore the space of possible use cases – to help developers, to find bugs in the implementation, to expand our own understanding. Much of the work of building even simple demo apps is app-related and not related to the underlying technologies. The leading candidate is Platatus, an app that offers a detailed, data-driven view of Mozilla's progress on delivering the technologies behind Progressive Web apps.

Service Worker Cookbook

Create a cookbook of self-contained code snippets showing how to use Service Workers to achieve various kinds of cacheing and push notification use cases.


2015 Q4 Deliverables

In Q4, we prepared for the launch of both Web Push and Service Workers in Firefox 44 by building Oghliner, the Service Worker cookbook, and the Platform Status page.

2015 Q3 Deliverables

In Q3, our goals for WADI engineering were (1) to transition off our legacy projects, (2) to educate ourselves about serviceworkers and web push, and (3) to plan for Q4. We had roughly a month of Q3 to work with. We accomplished these goals by encouraging each engineer to build small prototypes and sharing what we learned in a daily standup. These prototypes led to our presentation in the Firefox OS all-hands, a Github Universe talk, as well as the filing of several important platform and product bugs (and fixing of one!).

Bug tracking

These are bugs we've identified as critical to our ability to deploy these technologies to developers. We use bug 1201717 to track them.

ID Summary Priority Status
997779 [Meta] Implement Web Manifest spec in Gecko -- NEW
1004055 Users don't know where the doorhanger went P3 NEW
1056702 [meta] re-enable the serviceworker tests on b2g -- NEW
1130687 [Meta] Implement Service Worker Clients.openWindow() -- NEW
1153183 Add telemetry to Service Worker Cache -- NEW
1183625 support fetch window option -- NEW
1203274 Service worker wakeup and lifetime telemetry -- NEW
1204115 "Work Offline" option should affect localhost as well -- NEW
1208195 Show sites opened from Android home screen bookmarks as separate entries in the Android recent apps list -- NEW
1209369 Better service worker discovery for developers P2 NEW
1212648 [Meta] Support of Progressive Apps in Fennec -- NEW
1220747 Migrate about:serviceworkers to about:debugging. P2 NEW
1221965 Allow manually triggering a push subscription change P2 NEW
1224283 Enable ServiceWorkers on non release builds for b2g -- NEW
1225110 Support notification actions -- NEW
1228309 'online' event triggered when WiFi is turned on, before connecting to any network -- NEW
1228313 Information about offline/online events and property is confusing and sometimes conflicting between different MDN pages -- NEW
1237782 Remove support for appcache -- NEW
1253377 Ember devtools support P3 NEW

19 Total; 19 Open (100%); 0 Resolved (0%); 0 Verified (0%);

Other Resources

Program Plan tracking goal progression and key activities

(this page previously contained information about Firefox OS Apps)