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index.md
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---
title: browserSettings.useDocumentFonts
slug: Mozilla/Add-ons/WebExtensions/API/browserSettings/useDocumentFonts
page-type: webextension-api-property
browser-compat: webextensions.api.browserSettings.useDocumentFonts
---
{{AddonSidebar}}
A {{WebExtAPIRef("types.BrowserSetting", "BrowserSetting")}} object whose underlying value is a boolean.
By default, of course, web pages can specify the fonts they want using CSS properties like [`font-family`](/en-US/docs/Web/CSS/font-family). This setting enables an extension to instruct Firefox to ignore the fonts specified by the page, and only use system fonts.
Its underlying value is a boolean:
- `true`: use the fonts specified by the web page. This is the default.
- `false`: use the system fonts.
## Browser compatibility
{{Compat}}
## Examples
Set the setting to `false`:
```js
function logResult(result) {
console.log(`Setting was modified: ${result}`);
}
browser.browserSettings.useDocumentFonts.set({ value: false }).then(logResult);
```
{{WebExtExamples}}