To capture an entire Firefox page with its web fonts, wait for the page to render, check font readiness with await document.fonts.ready in the Web Console, then use Firefox’s Take Screenshot tool and choose Save full page. The font check is a useful timing signal, not a command to fetch every font declared by the site.
Wait for the page and its used fonts
Open the page in Firefox and let its content finish rendering. For a stronger check before capturing, open the Web Console for that page and evaluate:
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await document.fonts.readyThe promise resolves after fonts used by the document have loaded and layout operations have completed. It does not guarantee that every font mentioned in the page’s CSS has been downloaded: unused fonts may remain unloaded, and optional fonts may not load in time. This makes the check helpful for timing, but it cannot force a blocked or excluded font to load. MDN documents the FontFaceSet.ready behavior and limits.
Capture the full page in Firefox
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With the page open, right-click an empty area and select Take Screenshot. Alternatively, press Ctrl+Shift+S on Windows or Linux, or Command+Shift+S on macOS.
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In the screenshot interface, choose Save full page.
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Download the image or copy it to the clipboard.
Firefox also offers a visible-page capture, which includes only the viewport currently on screen. Choose full-page capture when you need content beyond the visible portion. See Mozilla’s Firefox screenshot instructions for the documented workflow and options.
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If the screenshot still uses fallback fonts
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Check the font request. If the font resource cannot be reached, Firefox cannot render it. Use Firefox’s developer tools to inspect whether the page’s font resource is loading successfully.
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Check whether remote fonts are blocked. A Firefox preference or an extension that blocks remote font downloads is a plausible cause. Temporarily review relevant settings or disable suspect extensions, then reload the page and wait for fonts again. Mozilla forum guidance discusses these possibilities, but it is older troubleshooting context rather than definitive current settings instructions: Mozilla Support discussion about missing web fonts.
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Remember what the readiness check means. If the site does not use a declared font in the rendered content, or an optional font has not loaded,
document.fonts.readydoes not establish that every font file is available. Verify the actual font resource rather than relying on the promise alone.
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Frequently Asked Questions
Does the Firefox screenshot tool capture the whole page or only what is on screen?
It supports both: choose Save full page for the entire webpage or the visible-page option for the current viewport.
Does document.fonts.ready make Firefox download every font declared on a page?
No. It resolves after used fonts and related layout work are ready; fonts that are unused or optional may not have been loaded.
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