Meeting 2025-03-04

• Team calendar

  • Next on Necko triage: Ed

• New contributors / Friends of Necko – Thank you!

  •  Simon Friedberger (:simonf)

    • Bug: 1906590 HTTPS-Only/First shouldn't try to downgrade pages on 3s timer that have HTTPS RR enabled

  •  Manuel Bucher [:manuel]

    • Bug: 1950069 Add unit tests for clearOrigin

  •  Oskar Mansfeld

    • Bug: 1949775 Remove or update metrics expiring in Firefox 138: networking.http_ip_addr_any_*

    • Bug: 1949776 Remove or update metrics expiring in Firefox 138: networking.set_cookie_* before Gecko version gets increased to 138 on 2025-03-03

  •  Sandor Molnar[:smolnar]

    • Bug: 1950553 Perma [Tier 2] dom/security/test/https-first/browser_https_rr_no_downgrade.js | single tracking bug

  •  Andrea Marchesini [:baku]

    • Bug: 1950565 CookieStore must enforce the maximum name/value pair size correctly

    • Bug: 1949778 Remove or update metrics expiring in Firefox 138: networking.set_cookie_expired_without_server_time before Gecko version gets increased to 138 on 2025-03-03

• Round Table

  • – enter public topics –

• Active Projects roadmap Fx136 rel Mar 04, Fx137 code freeze Feb 27

  • Private Network Access   Firefox Access Neutralization (FAN)

    • [sunil] Re-scoped project Proposal

    • [sunil] Implementing detection mechanism in Necko

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

    • No progress this week.

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

    • [sekim] Reached out to the QA team, the UI is currently being verified. Enabled secret setting on Nightly as well (previously it was only available on Debug).

    • (valentin) I’m working on migrating the heuristics to Android.

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

    • – enter updates –

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

    • [kershaw]

      • The upload goodput drops when the connection is established using 0-RTT.

        • Reproduced reliably on my local desktop. Still debugging the root cause.

  • 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)

    • – enter updates –

  • QUIC stream receive window auto-tuning

    • – enter updates –

  • QUIC Acknowledgement Frequency draft 10

    • – enter updates –

  • Implement WebTransport based on HTTP/2

    • [kershaw]

      • Milestone 1: Implementation of Capsule protocol is almost complete. Patches in review.

      • Milestone 2: Working on Http2WebTransportStream

  • NEL

    • (valentin) Landed 1948876 - Fix NEL implementation and WPT tests 

    • Looking into using reporting API and ClearDataService

  • 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

      • Do we need telemetry to catch a case where the background renewal returns a different result than what was cached, i.e. leading to possible breakage?

    • – enter updates –

  • Support compression dictionary transport

    • (jesup)

      • Initial cut done; able to receive dictionaries and offer them back, and then decompress dcb/dcz-encoded files correctly.  (passes wpts for this)

      • Doesn’t yet actually save dictionaries to disk, or load dictionary data from disk (it’s all in the in-memory cache for now).

      • Data in the cache for dictionaries is currently uncompressed (takes more space, may lower hitrate)

      • Filed 2 issues against the spec

      • Filed one issue against the WPT tests (they encoded and test for a bug in chrome’s impl)

    • [Ed] URLPattern integration

      • Still writing the gecko C++ wrapper

      • May be additional work when we get to supporting webidl needs: BringYourOwnRegex will mean working with the SpiderMonkey regex API, which is not so “ergonomic”

  • Performance work: 

    • TRR Performance work