There is an r+ patch which didn't land and no activity in this bug for 2 weeks.
:jesup, could you have a look please?
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Backed out for causing multiple bustages/failures

Backout link: https://hg.mozilla.org/integration/autoland/rev/837a3d407e1c473641116eb9e1a150237c764645

Push with failures

Failure log -> TEST-UNEXPECTED-ERROR | /builds/worker/checkouts/gecko/netwerk/test/unit/test_dictionary_storage.js:595:9 | 'headerValue' is assigned a value but never used. (no-unused-vars)

Failure log -> ERROR - /builds/worker/checkouts/gecko/netwerk/streamconv/converters/nsHTTPCompressConv.cpp:358:23: error: format '%d' expects argument of type 'int', but argument 4 has type 'nsresult' [-Werror=format=]

Failure log -> ERROR - /builds/worker/workspace/obj-build/dist/include/mozilla/net/Dictionary.h:313:14: error: unused variable 'rv' [-Werror,-Wunused-variable]

Failure log -> TEST-UNEXPECTED-FAIL | netwerk/test/unit/test_trr.js | test_server_up - [test_server_up : 84] "undefined" == "Error: could not find id"

Failure log -> TEST-UNEXPECTED-FAIL | /service-workers/service-worker/worker-interception.https.html

Failure log -> TEST-UNEXPECTED-FAIL | devtools/client/netmonitor/test/browser_net_copy_headers.js | Timed out while polling clipboard for requested data

https://hg.mozilla.org/mozilla-central/rev/d25d80d93174

Backed out for causing multiple failures

• Backout link
• Push with failures
• Failure Log
• Failure Log 2
• Failure Log 3

https://hg.mozilla.org/mozilla-central/rev/de97f7b81f69

Backed out for causing failures /dictionary-compressed.tentative.https.html.

Backout link: https://hg-edge.mozilla.org/integration/autoland/rev/339cb96b8aea9a433abdfee35eca4472ecb7074e

Push where failures started: https://treeherder.mozilla.org/jobs?repo=autoland&searchStr=windows%2C11%2Cx86%2C24h2%2Copt%2Cweb%2Cplatform%2Ctests%2Ctest-windows11-32-24h2%2Fopt-web-platform-tests%2Cwpt12&revision=f63dea815067f6fefbac80cce46e1a0589f66a31&selectedTaskRun=OXPZFu52Tyq66R0qicmggw.0

Failure log: https://treeherder.mozilla.org/logviewer?job_id=529651894&repo=autoland&task=OXPZFu52Tyq66R0qicmggw.0&lineNumber=10724

https://hg.mozilla.org/mozilla-central/rev/60f9fa2dd70c

Randell, is that a pref for a platform feature riding the 145 train? Should it be added to our release notes if this is the case? Thanks