[Launch options](https://cdpfleet.com/docs/options)

# `custom_fonts_only`

Expose only the fonts in `fonts`.

**Use it for:** Tests of how a site reacts to a minimal or specific font list; rarely what a normal persona needs.

**Browsers:** [Camoufox](https://cdpfleet.com/docs/browsers/camoufox#opt-custom_fonts_only).

## Details

-   **Type:** `boolean`
-   **Default:** false
-   **Example:** `{"custom_fonts_only":true}`

Drop the target OS's default font list and expose only the families listed in `fonts`.

Requires `fonts`. A listed family only renders if the server can draw it: Camoufox's bundled fonts are switched off in this mode, so a family that exists only in that bundle (Consolas, for example) stays invisible.

## Used in

-   [Case 52: Installed fonts as a fingerprint: what a width probe sees on each Camoufox persona](https://cdpfleet.com/docs/cases/fonts-fingerprint)
-   [Camoufox with a macOS font list](https://cdpfleet.com/docs/examples#camoufox-mac-fonts)

All options: [launch options](https://cdpfleet.com/docs/options).

---
Source: https://cdpfleet.com/docs/options/custom_fonts_only · Markdown: https://cdpfleet.com/docs/options/custom_fonts_only.md · All docs for AI tools: https://cdpfleet.com/llms.txt