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fix(chromium): restore automation launch flag - #42403

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Devin Rousso (dcrousso) wants to merge 1 commit into
microsoft:mainfrom
dcrousso:fix-42379
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fix(chromium): restore automation launch flag#42403
Devin Rousso (dcrousso) wants to merge 1 commit into
microsoft:mainfrom
dcrousso:fix-42379

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@dcrousso

@dcrousso Devin Rousso (dcrousso) commented Aug 25, 2026

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removing --enable-automation lets managed Edge hand off the browser process during SAML login

restore the default flag while preserving MCP launch behavior through an internal launch setting

regression from #40190

fixes #42379

removing `--enable-automation` lets managed Edge hand off the browser process during SAML login

restore the default flag while preserving MCP launch behavior through an internal launch setting
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Test results for "tests 1"

3 flaky ⚠️ [chromium-library] › library/video.spec.ts:294 › screencast › should capture navigation `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/video.spec.ts:736 › screencast › should work with video+trace `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/video.spec.ts:699 › screencast › should capture full viewport on hidpi `@chromium-ubuntu-22.04-node20`

51403 passed, 1238 skipped


Merge workflow run.

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Test results for "MCP"

8259 passed, 1361 skipped


Merge workflow run.

const browser = await browserType.launch({
tracesDir,
...config.browser.launchOptions,
...{ disableAutomation: true },

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You can use ignoreDefaultArgs option instead.

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Successfully merging this pull request may close these issues.

[Bug]: Microsoft SAML login closes page on Edge since 1.60; adding --enable-automation fixes regression

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