Launch 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.

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
• Camoufox with a macOS font list

All options: launch options.