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Popup menus not appearing correctly #7167

Description

@TimeTravelPenguin

Describe the bug

I don't know what is going on here, but for a few weeks now, Marimo has not been displaying correctly in my Firefox browser (on MacOS).

For some reason, some popup menus(?) do not correctly appear to display on top of other UI elements. This can be seen both in my notebooks when I try to @ reference variables, and also on the Marimo website when looking at some examples. Below are videos of this issues.

I do not know if this is a browser issue, a marimo issue, or just a me issue.

CleanShot.2025-11-13.at.22.31.41.mp4
CleanShot.2025-11-13.at.22.34.41.mp4

Will you submit a PR?

  • Yes

Environment

\`\`\`json

{
"marimo": "0.17.8",
"editable": false,
"location": "/Users/filup/Documents/Programming/Typst/Cellular/.venv/lib/python3.12/site-packages/marimo",
"OS": "Darwin",
"OS Version": "25.1.0",
"Processor": "arm",
"Python Version": "3.12.5",
"Locale": "en_AU",
"Binaries": {
"Browser": "--",
"Node": "v21.6.0"
},
"Dependencies": {
"click": "8.3.0",
"docutils": "0.22.3",
"itsdangerous": "2.2.0",
"jedi": "0.19.2",
"markdown": "3.10",
"narwhals": "2.11.0",
"packaging": "25.0",
"psutil": "7.1.3",
"pygments": "2.19.2",
"pymdown-extensions": "10.17.1",
"pyyaml": "6.0.3",
"starlette": "0.50.0",
"tomlkit": "0.13.3",
"typing-extensions": "4.15.0",
"uvicorn": "0.38.0",
"websockets": "15.0.1"
},
"Optional Dependencies": {
"basedpyright": "1.33.0",
"loro": "1.8.2",
"mcp": "1.21.1",
"python-lsp-ruff": "2.3.0",
"python-lsp-server": "1.13.1",
"ruff": "0.14.5"
},
"Experimental Flags": {
"inline_ai_tooltip": true,
"external_agents": true,
"chat_modes": true,
"performant_table_charts": true
}
}

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    browser:firefoxPlease let us know if this affects other browsers toobugSomething isn't workinggood first issue (typescript)Good first issue on the frontend/typescript

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