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Description
Description
When I attempt to type a# character into a cell in any Jupyter notebook using the standard macOS OPTION-3 key combination instead of entering the character into the code or markdown instead the Jupyter sidebar is opened or closed and switched to the Table of Contents view.
Reproduce
Using a Mac running macOS Sequoia 15.7.2...
- Open Firefox (I'm using 144.0.2)
- Open a local Jupyter notebook: e.g., by entering its URL in the address bar (note that Jupyter Lab must also be running - if Firefox is your default browser you can simply start Jupyter Lab with
jupyter labfrom your terminal, and it should open in Firefox - from there you can open a notebook) - Edit any cell in the notebook
- Attempt to enter a
#character by pressing the OPTION-3 key combination - Repeatedly press the OPTION-3 key combination to continue opening and closing the Jupyter sidebar
Expected behavior
What should happen when I press OPTION-3 is that a# character should be entered into the cell I'm editing.
Context
- Operating System and version: macOs Sequoia 15.7.2
- Browser and version: Firefox 144.0.2
- Jupyter Notebook version: 4.4.10
Troubleshoot Output
% jupyter troubleshoot/Users/bart/Library/CloudStorage/Dropbox/jupyter/exabler/.venv/bin/python3: No module named pip$PATH:/Users/xxxx/xxxx/xxxx/xxxx/xxxx/xxxx/.venv/bin/Users/xxxx/.local/bin/opt/homebrew/opt/ruby/bin/opt/homebrew/opt/libpq/bin/Users/xxxx/.nvm/versions/node/v18.20.2/bin/opt/local/bin/opt/local/sbin/opt/homebrew/bin/opt/homebrew/sbin/usr/local/bin/System/Cryptexes/App/usr/bin/usr/bin/bin/usr/sbin/sbin/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin/Library/Apple/usr/bin/Applications/iTerm.app/Contents/Resources/utilitiessys.path:
/Users/xxxx/xxxx/xxxx/xxxx/xxxx/xxxx/.venv/bin
/Users/xxxx/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python314.zip
/Users/xxxx/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14
/Users/xxxx/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/lib-dynload
/Users/xxxx/xxxx/xxxx/xxxx/xxxx/xxxx/.venv/lib/python3.14/site-packagessys.executable:
/Users/xxxx/xxxx/xxxx/xxxx/xxxx/xxxx/.venv/bin/python3sys.version:
3.14.0 (main, Oct 28 2025, 12:03:45) [Clang 20.1.4 ]platform.platform():
macOS-15.7.2-arm64-arm-64bit-Mach-Owhich -a jupyter:
/Users/xxxx/xxxx/xxxx/xxxx/xxxx/xxxx/.venv/bin/jupyter
Command Line Output
% jupyter lab[I 2025-11-08 16:17:09.306 ServerApp] jupyter_lsp | extension was successfully linked.[I 2025-11-08 16:17:09.307 ServerApp] jupyter_server_terminals | extension was successfully linked.[I 2025-11-08 16:17:09.309 ServerApp] jupyterlab | extension was successfully linked.[I 2025-11-08 16:17:09.312 ServerApp] Writing Jupyter server cookie secret to /Users/xxxx/Library/Jupyter/runtime/jupyter_cookie_secret[I 2025-11-08 16:17:09.941 ServerApp] notebook_shim | extension was successfully linked.[I 2025-11-08 16:17:09.987 ServerApp] notebook_shim | extension was successfully loaded.[I 2025-11-08 16:17:09.988 ServerApp] jupyter_lsp | extension was successfully loaded.[I 2025-11-08 16:17:09.989 ServerApp] jupyter_server_terminals | extension was successfully loaded.[I 2025-11-08 16:17:09.991 LabApp] JupyterLab extension loaded from /Users/xxxx/xxxx/xxxx/xxxx/xxxx/xxxx/.venv/lib/python3.14/site-packages/jupyterlab[I 2025-11-08 16:17:09.991 LabApp] JupyterLab application directory is /Users/xxxx/xxxx/xxxx/xxxx/xxxx/xxxx/.venv/share/jupyter/lab[I 2025-11-08 16:17:09.991 LabApp] Extension Manager is 'pypi'.[I 2025-11-08 16:17:10.045 ServerApp] jupyterlab | extension was successfully loaded.[I 2025-11-08 16:17:10.046 ServerApp] Serving notebooks from local directory: /Users/xxxx/xxxx/xxxx/xxxx/xxxx/xxxx[I 2025-11-08 16:17:10.046 ServerApp] Jupyter Server 2.17.0 is running at:[I 2025-11-08 16:17:10.046 ServerApp] http://localhost:8888/lab?token=xxxx[I 2025-11-08 16:17:10.046 ServerApp] http://127.0.0.1:8888/lab?token=xxxx[I 2025-11-08 16:17:10.046 ServerApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).[C 2025-11-08 16:17:10.052 ServerApp]To access the server, open this file in a browser: file:/Users/xxxx/Library/Jupyter/runtime/jpserver-7400-open.htmlOr copy and paste one of these URLs: http://localhost:8888/lab?token=xxxx http://127.0.0.1:8888/lab?token=xxxx[I 2025-11-08 16:17:10.300 ServerApp] Skipped non-installed server(s): basedpyright, bash-language-server, dockerfile-language-server-nodejs, javascript-typescript-langserver, jedi-language-server, julia-language-server, pyrefly, pyright, python-language-server, python-lsp-server, r-languageserver, sql-language-server, texlab, typescript-language-server, unified-language-server, vscode-css-languageserver-bin, vscode-html-languageserver-bin, vscode-json-languageserver-bin, yaml-language-server
[W 2025-11-08 16:17:12.606 LabApp] Could not determine jupyterlab build status without nodejs
[I 2025-11-08 16:17:19.790 ServerApp] Writing notebook-signing key to /Users/xxxx/Library/Jupyter/notebook_secret
[W 2025-11-08 16:17:19.791 ServerApp] Notebook filing-data-synthesiser.ipynb is not trusted
[I 2025-11-08 16:17:20.042 ServerApp] Kernel started: xxxx
[I 2025-11-08 16:17:20.907 ServerApp] Connecting to kernel xxxx.
[W 2025-11-08 16:17:20.907 ServerApp] The websocket_ping_timeout (90000) cannot be longer than the websocket_ping_interval (30000).
Setting websocket_ping_timeout=30000
[I 2025-11-08 16:17:20.911 ServerApp] Connecting to kernel xxxx.
[I 2025-11-08 16:17:20.914 ServerApp] Connecting to kernel xxxx.
[I 2025-11-08 16:19:19.822 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 16:31:20.269 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 16:33:20.987 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 17:01:23.180 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 17:03:23.215 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 17:05:23.262 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 17:07:23.311 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 17:16:17.672 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 17:19:24.726 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 17:21:25.594 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 17:25:25.806 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 17:27:25.846 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 17:29:25.884 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 17:31:25.991 ServerApp] Saving file at /blah.ipynb
[I 2025-11-08 17:33:26.614 ServerApp] Saving file at /blah.ipynb
[I 2025-11-09 16:09:43.458 ServerApp] Saving file at /blah.ipynb
[I 2025-11-09 16:09:44.612 ServerApp] Starting buffering for xxxx
[I 2025-11-09 16:59:32.400 ServerApp] Kernel started: xxxx
[I 2025-11-09 16:59:32.791 ServerApp] Connecting to kernel xxxx
[I 2025-11-09 17:07:32.519 ServerApp] Saving file at /blah2.ipynb
[I 2025-11-09 17:09:32.566 ServerApp] Saving file at /blah2.ipynb
[I 2025-11-09 17:11:32.602 ServerApp] Saving file at /blah2.ipynb
[I 2025-11-09 17:13:32.643 ServerApp] Saving file at /blah2.ipynb
[I 2025-11-09 17:15:33.325 ServerApp] Saving file at /blah2.ipynb
[I 2025-11-09 17:35:34.084 ServerApp] Saving file at /blah2.ipynb
[I 2025-11-09 17:39:34.418 ServerApp] Saving file at /blah2.ipynb
[I 2025-11-09 17:39:38.418 ServerApp] Saving file at /blah2.ipynb
Browser Output
Starting application in workspace: "default" [jlab_core.e595af6ce37775e8a915.js:1:9878](http://localhost:8888/static/lab/jlab_core.e595af6ce37775e8a915.js?v=xxxx)Starting WebSocket: ws://localhost:8888/api/kernels/xxxx 3 [jlab_core.e595af6ce37775e8a915.js:1:1425379](http://localhost:8888/static/lab/jlab_core.e595af6ce37775e8a915.js?v=xxxx)This site appears to use a scroll-linked positioning effect. This may not work well with asynchronous panning; see https://firefox-source-docs.mozilla.org/performance/scroll-linked_effects.html for further details and to join the discussion on related tools and features! [blah.ipynb](http://localhost:8888/lab/tree/blah.ipynb)Starting WebSocket: ws://localhost:8888/api/kernels/xxxx [jlab_core.e595af6ce37775e8a915.js:1:1425379](http://localhost:8888/static/lab/jlab_core.e595af6ce37775e8a915.js?v=xxxx)Uncaught (in promise) TypeError: can't access property "highlightNext", i is undefined _stepNext http://localhost:8888/static/lab/jlab_core.e595af6ce37775e8a915.js?v=xxxx:1 highlightNext http://localhost:8888/static/lab/jlab_core.e595af6ce37775e8a915.js?v=xxxx:1 highlightNext http://localhost:8888/static/lab/jlab_core.e595af6ce37775e8a915.js?v=xxxx:1 onHighlightNext http://localhost:8888/static/lab/jlab_core.e595af6ce37775e8a915.js?v=xxxx:1 _onSearchKeydown http://localhost:8888/static/lab/jlab_core.e595af6ce37775e8a915.js?v=xxxx:1 onKeydown http://localhost:8888/static/lab/jlab_core.e595af6ce37775e8a915.js?v=xxxx:1 onKeyDown http://localhost:8888/static/lab/jlab_core.e595af6ce37775e8a915.js?v=xxxx:1 onKeyDown http://localhost:8888/static/lab/jlab_core.e595af6ce37775e8a915.js?v=xxxx:1 Ue http://localhost:8888/static/lab/961.29c067b15a524e556eed.js?v=xxxx:2 Qe http://localhost:8888/static/lab/961.29c067b15a524e556eed.js?v=xxxx:2 je http://localhost:8888/static/lab/961.29c067b15a524e556eed.js?v=xxxx:2 al http://localhost:8888/static/lab/961.29c067b15a524e556eed.js?v=xxxx:2 ul http://localhost:8888/static/lab/961.29c067b15a524e556eed.js?v=xxxx:2 dl http://localhost:8888/static/lab/961.29c067b15a524e556eed.js?v=xxxx:2 Os http://localhost:8888/static/lab/961.29c067b15a524e556eed.js?v=xxxx:2 De http://localhost:8888/static/lab/961.29c067b15a524e556eed.js?v=xxxx:2 dl http://localhost:8888/static/lab/961.29c067b15a524e556eed.js?v=xxxx:2 lt http://localhost:8888/static/lab/961.29c067b15a524e556eed.js?v=xxxx:2 tt http://localhost:8888/static/lab/961.29c067b15a524e556eed.js?v=xxxx:2