Meeting 2025-03-11

• Team calendar

  • Next on Necko triage: Sunil

• New contributors / Friends of Necko – Thank you!

  • Tim Huang[:timhuang]

    • Bug: 1951536 Assertion failure: false, at /builds/worker/checkouts/gecko/netwerk/cookie/CookieServiceChild.cpp:319

• Round Table

  • – enter public topics –

• Active Projects roadmap Fx137 rel Apr 01, Fx138 code freeze Mar 27

  • Firefox Essential Internal Services Toughening[FEISTY] (in progress, TBD)

    • – enter updates –

  • DoH Enablement - Fenix and Focus (in progress, H2-2025)

    • (sekim) Landed a fix for a bug in DoH on Android. Now DoH settings are loaded from the application layer instead of the Gecko engine (we can preserve the settings when Fenix is reloaded).

  • 3rd Party Cookie Deprecation (in progress, target TBD)

    • Will ship with CHIPS, pending target

    • – enter updates –

  • Firefox/Chrome benchmark test suite (in progress, EO March)

    • [kershaw]

      • 14 days results

      • Short summary:

        • Low bandwidth scenarios: Stable

        • High bandwidth scenarios: High deviations due to some known bugs

  • necko-glean: (sekim) Landing glean patches using #ifndef ANDROID blocks tracking such blocks using Bug 1901798  

    • – enter updates –

  • Fast UDP I/O in Firefox (in progress, target Fx137)

    • Experiment in review.

    • ECN black hole detection discussion

  • QUIC stream receive window auto-tuning

    • – enter updates –

  • QUIC Acknowledgement Frequency draft 10

    • – enter updates –

  • Implement WebTransport based on HTTP/2

    • (sekim) Implement Http2WebTransportSession::SendDatagram is WIP

    • [kershaw] The implementation of Capsule protocol is under review

  • Support Compression Dictionary Transport (in progress, TBD)

    • Basic functionality works - decompression

      • Doesn’t store on or restore from disk - memory only so far

      • Haven’t done CORS or site-clear yet (though if it’s synced to the disk, clearing cache entries will inherently clear it)

      • Stubbed URLPattern support until the rust lib is imported

    • Usage in the field: mostly Google’s GPT (Google Tag Manager) for ads

      • ~100-130K br-compressed file becomes like 10-30K

      • Major block is CDN support

      • Secondary block is CMS support

  • Improve Fenix Performance in Slow and Transitional Networks (scheduled, TBD)

    •  – enter updates –

  • Firefox Access Neutralization (FAN) (planning, TBD)

    • [sunil] Re-scoped project Proposal

    • – enter updates –

  • NEL

    • – enter updates –

  • DNS Cache Expiry:

    • [oskar]

    • Experiment on increasing dns cache size ended, see result writeup here. TLDR:

      • Could see the amount of cache evictions dropping by ~50%

      • No visible effect on cache hit rate though, probably because there aren’t enough cache evictions happening in general for the halving to have an effect on hit rate statistics

      • We are still increasing the pref because there aren’t any downsides to it

        • https://phabricator.services.mozilla.com/D239900

    • Follow up experiment for increasing the grace period is planned after bug was fixed

      • Experiment Brief - DNS caching experiment followup (grace period)

      • https://experimenter.services.mozilla.com/nimbus/dns-caching-exp-grace-period/summary

    • – enter updates –

  • Performance work: 

    • – enter updates –