Tracking issues on Nexus Devices with Android 4.3. Currently we have roughly 3.8% of our user base on Android 4.3 (Compared to 35.8% on 4.1), meaning that 4.3 issues will continue to grow. Currently the only Nexus 10 rating on GP is a 1-star, but we will continue to track these reports.
Roland wrote a SUMO KB article for these issues: [https://support.mozilla.org/kb/firefox-issues-nexus-10-and-android-43 Firefox issues with Nexus 10 and Android 4.3]