User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0 Build ID: 20150316202753 Steps to reproduce: Try to open the Marketplace app. Marketplace version: "20141229.21136" apptype b2g vendor Mozilla name B2G version 3.0.0.0-prerelease appbuildid 20150318103138 platformbuildid 20150318103138 platformversion 39.0a1 geckobuildid 20150318103138 geckoversion 39.0a1 locale en-US os B2G hardware qcom processor arm compiler eabi Actual results: W/GeckoConsole( 1936): [JavaScript Error: "NS_ERROR_NOT_IMPLEMENTED: SetNFCFocus for in-process mode is not yet supported" {file: "jar:file:///system/b2g/omni.ja!/components/BrowserElementParent.js" line: 901}] Expected results: Kaboom.

You expected kaboom? :P This error is harmless, but we should catch it.

Then, Fabrice, I don't know if this is related: https://www.youtube.com/watch?v=sl3voFtyCBI I'm attaching a logcat with I/Marketplace filtered.

Your build is outdated. It's crashing because of an issue with mozMobileConnections that was backed out.