The Tool Desk
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Mozilla documents this workflow, along with alternative Developer Tools and Web Console methods, in its Firefox screenshot help.
Use Firefox’s built-in full-page screenshot
- Open the long webpage in Firefox for Linux and wait for the content you need to appear.
- Right-click an unoccupied part of the page and select Take Screenshot. You can also press Ctrl+Shift+S.
- In the screenshot interface, select Save full page in the upper-right corner. Do not choose Save visible, which captures only the current viewport.
- Click Download to save the PNG in Firefox’s normal download folder, or choose Copy to place the image on the clipboard.
Firefox also lets you select a rectangular region or an automatically highlighted page section. Those modes are useful for partial captures, but only Save full page includes the page’s scrollable document.
Before you capture
- Close menus, dialogs and browser panels that you do not want in the image.
- Allow text, images and other content to finish loading. Pages that add material only after scrolling may need extra attention.
- Check the result after downloading; a very long image can be difficult to inspect at normal zoom.
Capture a full page from Firefox Developer Tools
Developer Tools provide a second browser-based route and are useful when you already work with Firefox’s inspection tools.
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- Open Developer Tools with F12 or the browser’s Developer Tools command.
- Open the Developer Tools settings and locate Available Toolbox Buttons.
- Enable Take a screenshot of the entire page.
- Use the new camera button in the toolbox. Firefox saves the full-page image in its Downloads directory.
The exact button and setting are documented in Firefox’s Developer Tools screenshot documentation.
Use Firefox’s Web Console for configurable captures
Firefox’s Web Console has a :screenshot helper. This is entered in the browser console, not in a Linux shell. Add --fullpage to include content outside the current window:
:screenshot --fullpage --filename page.pngThe documented helper also supports options for common capture adjustments:
--filenamechooses the output path or name.--delaywaits before capturing, useful when a page animates or finishes rendering after navigation.--dprsets device-pixel ratio.--selectorcaptures a particular element rather than the whole document.--clipboardcopies the result instead of relying only on a file.--filewrites the capture to a file.
Open the Web Console from Developer Tools, enter the command, and press Enter. Refer to the official helper documentation for the current syntax and behavior of each option.
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What about Firefox’s headless Linux command?
Mozilla documents --headless and --screenshot [path] for Linux GTK builds, with --window-size controlling the dimensions:
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firefox --headless --screenshot page.png --window-size=1440,900 https://example.comThis is useful for automated, fixed-window captures. However, the command-line documentation does not explicitly promise that --screenshot captures the entire scrollable document. If full-page output is a requirement, use the Web Console’s documented --fullpage option or the built-in Save full page action instead of assuming the headless image contains every section.
Full webpage versus full monitor: the distinction
A browser full-page screenshot stitches or renders the document beyond the visible viewport. A desktop utility’s “full” command generally means the complete display or all connected monitors.
For example, Flameshot documents flameshot gui, flameshot screen and flameshot full. Its full mode captures all monitors, not the entire scrollable webpage. A normal Print Screen key has the same limitation: it records what is currently visible. See the Flameshot command-line options for the distinction. Installation methods vary by distribution; the project lists packages plus AppImage and Flatpak options in its Linux installation guide.
Which Linux method should you choose?
| Method | Best for | Important detail |
|---|---|---|
| Firefox screenshot UI | One-off captures with minimal setup | Choose Save full page, then Download or Copy |
| Developer Tools button | People already using Firefox inspection tools | Enable Take a screenshot of the entire page first |
Web Console :screenshot |
Delay, selector, filename, clipboard or DPR control | Use --fullpage; this is a browser-console command |
| Headless CLI | Scripts needing repeatable viewport captures | Documented screenshot behavior is not explicitly full-page |
| Flameshot or Print Screen | Desktop and monitor images | Not a scrollable webpage capture |
Troubleshooting incomplete or incorrect captures
The image stops at the visible viewport
Return to the screenshot controls and select Save full page, not Save visible. If you used the headless command, switch to the built-in UI or :screenshot --fullpage, whose documentation explicitly describes full-page behavior.
Content loaded only after scrolling is missing
Some sites use lazy loading or an internal scroll area. Wait for the page to finish loading, then inspect the downloaded image. If the content lives inside a panel with its own scrollbar, the browser document and that panel are different scroll containers; Firefox’s page capture may not treat the panel as the main document. In that case, capture the panel with the Web Console’s --selector option or use the site’s own export feature.
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A page contains a fixed header or overlapping widgets
Fixed navigation, chat controls and consent dialogs can appear repeatedly or cover content. Dismiss overlays before capturing and verify the final image. A delay supplied to the Web Console helper can allow animations or late layout changes to settle.
The crosshair will not follow the mouse on Wayland
Mozilla documents a Wayland limitation in Firefox’s screenshot interface: mouse movement of the selection crosshair does not work. Use the documented keyboard movement and selection controls instead, or choose Save full page when you do not need to draw a region. Details are in the Firefox Help instructions.
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A long page at a high device-pixel ratio can produce a very tall PNG. For a smaller result, use the Web Console’s --dpr option or capture a specific section with --selector. For documents intended for printing, a PDF workflow may be more practical than one extremely tall image.
Performance and reliability considerations
Full-page capture requires Firefox to render content outside the current viewport, so very long pages can take longer and consume more memory than a visible-area shot. Keep the tab stable while the capture runs, and avoid navigating away until the file is downloaded. Dynamic advertisements, infinite feeds and content that changes while scrolling can make two captures differ; record the URL and capture time when the image is evidence or documentation.
For repeatable work, fix the viewport, wait for a known selector or delay, and use a deterministic filename. Always open the output once to check that the bottom of the page, lazy-loaded images and any required interactive state are present.
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Or skip the browser setup:
ScreenshotNeo is a website screenshot API and MCP server. A single request returns a PNG, JPEG, WebP or PDF, so you can capture a long page from a Linux script without driving a desktop browser manually. The API accepts the URL and access key as query parameters:
cURL
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpPython
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)Node.js
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);See the ScreenshotNeo documentation for request options. It can load lazy images, capture an element by CSS selector, set a viewport or one of 12 device presets, use retina scale, apply dark mode, inject CSS or JavaScript, click an element, wait for a selector, delay or network idle, block ads and trackers, supply headers, cookies, a user agent, Authorization, timezone or geolocation, and return PDFs with paper size, margins, orientation and page ranges. It also supports transparent backgrounds, resizing, a chosen cache TTL, signed links for public images, asynchronous jobs with signed webhooks, bulk capture of up to 100 URLs per call, usage reporting and an OpenAPI specification. Parameter names used by other screenshot APIs also work, which can simplify migration.
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FAQ
Can Firefox copy a full-page screenshot directly?
Yes. In the screenshot interface choose Save full page, then select Copy instead of Download.
Does Flameshot capture a webpage’s entire scroll length?
No. Its documented full mode captures all monitors. Use Firefox’s page screenshot feature for a scrollable document.
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Is :screenshot a Linux terminal command?
No. Enter it in Firefox’s Web Console. The terminal-oriented headless command is a separate interface.
Frequently Asked Questions
Can Firefox copy a full-page screenshot directly?
Yes. In the screenshot interface choose Save full page, then select Copy instead of Download.
Does Flameshot capture a webpage’s entire scroll length?
No. Its documented full mode captures all monitors. Use Firefox’s page screenshot feature for a scrollable document.
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Is :screenshot a Linux terminal command?
No. Enter it in Firefox’s Web Console. The terminal-oriented headless command is a separate interface.
Quick Recap
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