OpenCapture › How-to › Full page screenshot in Firefox
How to take a full page screenshot in Firefox
Firefox is the one browser that ships a real full-page screenshot tool — no extension, no DevTools, two clicks from the right-click menu. It is genuinely good, and it has three hard limits. Both halves are below.
Method 1 — the tool already in Firefox
Nothing to install. This captures the entire page, not just the part you can see.
- Right-click an empty part of the page — not a link, not an image, or you will get the menu for that element instead.
- Choose Take Screenshot. The page dims and a small panel appears.
- Click Save full page, at the top right. The other button, Save visible, only captures what currently fits on screen.
- Check the preview, then Download. The file lands in your downloads folder as a PNG.
You can also drag a box over part of the page to capture just that region, which is the one thing the built-in tool does that most extensions make harder.
Where the built-in tool stops
Three limits, in the order you are likely to hit them:
It only saves PNG
There is no PDF option. If you are archiving a page, filing an expense, or sending something to someone who expects a document, you get an image file and have to convert it yourself. Converting a very tall PNG to PDF usually re-introduces the page-break problem you were trying to avoid.
Long pages do not always come back whole
On an ordinary content page it does exactly what it says — a Wikipedia article comes back complete, top to bottom. The behaviours below turn up on app-like sites, and they are worth recognising before you assume something is wrong at your end. If a plain page like Wikipedia also fails for you, the problem is somewhere else.
The bottom comes back blank. The image has the full height, but the lower part of it has nothing in it. The obvious workaround does not reliably help: scrolling the page through first, so that every part of it has been on screen once, and then capturing again, can still come back blank.
There is no editing step
What you get is the raw page. If you need to crop the cookie banner off the top, circle the thing you are pointing at, or blur an email address before sending it, you are opening a separate image editor.
Method 2 — capture and edit in one pass
This is where OpenCapture fits. It is a full-page screenshot extension that runs in Firefox as well as Chrome and Edge, it is free, and it needs no account.
- Install it from Firefox Add-ons and pin the icon to your toolbar.
- Open the page you want and click the OpenCapture icon.
- Choose full page — it stitches the whole scroll height into one image.
- Edit before you export: crop, draw, add text or shapes, blur anything that should not leave your machine.
- Export as PNG or PDF.
The capture runs on your device. There is no upload step in the code path, and the source is on GitHub if you would rather check that than take it on trust.
Use the built-in tool when the page is short, you want a PNG, and you do not need to change anything. It is already there and it is two clicks. The extension earns its place on long pages, when you need a PDF, or when you need to edit before sending.
Firefox users have been an afterthought in this category
Most full-page screenshot extensions are Chrome-only. If you have gone looking for one, you have probably found a list where half the entries do not install. OpenCapture ships a Firefox build alongside the Chrome and Edge ones, and the comparison against the best-known Chrome tool is on the GoFullPage alternative page.
Take a full page screenshot in Firefox
Questions
Does Firefox have a built-in full page screenshot?
Yes. Right-click an empty area of the page, choose Take Screenshot, then click Save full page. It captures the entire scroll height and saves a PNG, with no extension required.
Why is the bottom of my Firefox screenshot blank?
The image comes back with its full height but nothing in the lower part. Scrolling the page through first, so that every part of it has been on screen once, does not reliably fix it. On an ordinary content page the problem does not arise — a Wikipedia article comes back complete, top to bottom.
Can Firefox save a webpage screenshot as a PDF?
Not from the screenshot tool, which only produces PNG. You can print the page to PDF with Ctrl + P, but that re-typesets the page for paper. To keep the page looking as it did on screen and still get a PDF, capture it as one image and export that to PDF — see webpage to PDF.