chore(extension): bump version to 0.4.0

[Yury Semikhatsky (yury-s)]

Summary

• Bump extension version to 0.4.0 in manifest.json and package.json

[github-actions]

🟢 CI is clear — the one failure is a pre-existing flake

Hi, I'm the Playwright bot and I took a look at the failing CI on this PR.

This PR only bumps the @playwright/extension version from 0.3.0 to 0.4.0 (manifest.json, package.json, package-lock.json). The single red test — mcp/cli-devtools.spec.ts:115 on Firefox/Windows — is a known flake that fails on unrelated PRs too, so nothing here looks caused by your change.

Details

Overall: The "tests 1" report has only flaky/interrupted tests (5 flaky, 0 failed), so there's nothing to triage there. The "MCP" report has one real failure, and it checks out as a pre-existing flake.

Pre-existing flake / infra

• [firefox] › mcp/cli-devtools.spec.ts:115 › per-part commands extract individual parts @mcp-windows-latest-firefox — flaky on this exact bot: failed 9 of 699 runs (~1.3%), passed the other 690. Eight of those failures are on SHAs unrelated to this PR — PRs chore: mark v1.62.1 #42020, feat(trace-viewer): show test annotations in the trace viewer #42060, chore: remove experimental component testing #42168, fix(extension): do not treat orphaned preferences entries as an installed extension #42224, feat(mcp): add browser_emulate_media tool and --color-scheme option #42244, fix(tracing): allow restarting tracing after a failed stop #42425, chore(video): emit frames with real timestamps, drop frame number quantization #42480, plus a main push — spread from late July through late August. It's Firefox-on-Windows only; every other browser/OS passes 100%. A version-number bump for the extension package doesn't exercise the cli-devtools MCP flow, so the diff can't reach it.

_{Triaged by the Playwright bot - agent run}

[github-actions]

Test results for "tests 1"

6 flaky

⚠️ [chromium-library] › library/video.spec.ts:699 › screencast › should capture full viewport on hidpi `@frozen-time-library-chromium-linux`
⚠️ [chromium-library] › library/browsercontext-page-event.spec.ts:173 › should work with Ctrl-clicking `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/video.spec.ts:736 › screencast › should work with video+trace `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/video.spec.ts:736 › screencast › should work with video+trace `@chromium-ubuntu-22.04-node20`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:257 › third party 'Partitioned;' cookies `@firefox-ubuntu-22.04-node20`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:470 › top level 'Partitioned;' cookie and same origin iframe `@firefox-ubuntu-22.04-node20`

51276 passed, 1241 skipped

---

Merge workflow run.

[github-actions]

Test results for "MCP"

8305 passed, 1367 skipped

---

Merge workflow run.