Meeting 2024-05-14

• Team calendar

  • Next on Necko triage: Valentin

• New contributors / Friends of Necko

  • None in the last week

• Round Table

  • (sunil) Enable redirects for auth retries in release

    • Start rollout for using Release Experiments

    • Do we need more telemetry probes to identify regression sooner?

      • Probes for channel status exist

        • Success rate of channel monitor changes in trend

        • How can we see exact regressions introduced?

          • If regression we will never resolve 200 after 401

          • [acreskey]: Feature Manifest

          • https://searchfox.org/mozilla-central/source/toolkit/components/nimbus/FeatureManifest.yaml

          • Leverage a gradual rollout

            • Can we target users with specific auth?

            • Ask data folks for guidance on % of population

  • (sunil) Currently we use PFetch for workers and keepalive. Proposal to use PFetch for all Fetch requests. 

    • Reduces main thread contention

    • HTTPChannelParent/Child, logging and cookies dependencies 

    • Needs investigation/scoping, needs decision before we implement Fetch Streaming Upload

• Active Projects roadmap Fx126 rel May 14, Fx127 soft freeze May 09

  • OMT: Move OnStartRequest and OnStopRequest to the content process (paused, target: TBD)

    • OMT OnStart/OnStop Request (content) threading/api model

    • new Project Plan

    • Split HTML5Parser OnStop - OMT Shipped in Fx122 

    • Split CSSLoader OnStop - OMT riding the trains in Fx126

    • OnStart consumer

    • – enter updates –

  • Optimize, Measure and add tests for Speculative Connections (riding the trains, target: Fx126) 

    • – enter updates –

  • zstd content-encoding: (riding the trains, Fx126)

    • – enter updates –

  • Native HTTPS RR Implementation (in progress, target Fx127)

    • Riding the trains in 127

    • Sent Intent To Ship: Resolving HTTPS records using platform DNS APIs 

  • 3rd Party Cookie Deprecation (in progress, target Fx128)

    • [Ed] Wrote test for current implementation so far.

    • [Ed] Next steps: add test for insecure purging first

  • Fetch keepalive: (in progress, Target Fx129) 

    • [Sunil] Addressing review comments from Eden. 

    • We pass all the WPTs for the implemented feature.

    • Plan to merge the changes this week.

• HTTP Priorities Experiments (in progress, target Fx 128 )

  • Will start landing patches this week.

• Firefox/Chrome benchmark test suite (in progress, target H1 2024)

  • Created a JIRA issue to request test machines.

• Interop 2024 URL (in progress, target H2 2024)

  • [Ed] Continuing work on default-uri bypass list

• Performance work: 

  • New experiments:

    • Performance Calibration (A/A/A) on Fenix, planned to start today, nightly, beta, release

      • https://experimenter.services.mozilla.com/nimbus/fenix-performance-metric-calibration/edit/overview

    • OMT Decompression + html5Parser, cssLoader (Thank you Sunil)

  • [acreskey] 

    • Investigating: First visual change and reported time to first byte 1 second slower on Fenix compared to Chrome, en.m.wikipedia.org, high latency network

      • https://bugzilla.mozilla.org/show_bug.cgi?id=1895908

  • FYI: 

    • Predictor christmas tree:

      • https://bugzilla.mozilla.org/show_bug.cgi?id=1890559#c4

      • (greg) Keep enabled?

        • Continue investigating and assess performance priority

  • [jesup] Working on a next-stage OMT proposal

• [jesup] WebSocketStream - Chrome is pushing it.  Mt is very slightly positive if we remove some random cruft from the PR. Kagami and I are skeptical; we could do it; it wouldn’t be hard - but the big question would be “why not WebTransport?”  (especially once WebTransport over H2 is available globally).