Open source Firefox add-on to take screenshot of whole page

Question

I want to take an image of a whole web page, including what is not shown currently on-screen (scrolling).

Absolute requirements:

• MUST BE OPEN SOURCE (unlike in that other question), please provide a link to the source
• Grab the whole page
• Save as PNG
• Works on Linux/Mac/Windows

I prefer an add-on that ONLY grabs the whole page. If I wanted to grab only a selection of the page I would use my OS built-in screenshot tool.

What I have tried:

• I was using Nimbus but they started inserting plugs to unwanted services.
• hitting shift-f2 for the console then typing in screenshot /path/to/file --fullpage takes too much time.
• Abduction! is open source, but not maintained anymore and does not work in current Firefox.

Answer 1

Firefox has now a built-in "Take a screenshot" tool in address bar (Click the three dots). It has full page screenshot and visible page screenshot. Can copy to clipboard or download. Pretty convinient!

Answer 2

You can already do it with Firefox:

1. Press F12
2. Click on settings
3. Enable full-page screenshot
4. Now you can always click on that camera icon and the screenshot will be saved to your Downloads folder

Answer 3

You can also press : or Shift+F2 to open the Graphic Command Line then type in screenshot filename to take a screenshot. To take a whole page, use :screenshot filename -fullpage.

You can also visit the help page via help screenshot. Below is what it shows:

Synopsis: screenshot [filename] [--clipboard] [--imgur] [--delay ...] [--dpr ...] [--fullpage] [--selector ...] [--chrome]
Save a PNG image of the entire visible window (optionally after a delay)

Options:
[filename] (string, helpManOptional)
The name of the file (should have a '.png' extension) to which we write the screenshot.
[--clipboard] (boolean, required)
True if you want to copy the screenshot instead of saving it to a file.
[--imgur] (boolean, required)
Use if you want to upload to imgur.com instead of saving to disk
[--delay ...] (number, helpManOptional)
The time to wait (in seconds) before the screenshot is taken
[--dpr ...] (number, helpManOptional)
The device pixel ratio to use when taking the screenshot
[--fullpage] (boolean, required)
True if the screenshot should also include parts of the webpage which are outside the current scrolled bounds.
[--selector ...] (remote, helpManOptional)
A CSS selector for use with document.querySelector which identifies a single element

Advanced Options:
[--chrome] (boolean, required)
True if you want to take the screenshot of the Firefox window rather than the web page's content window.

Note: this only works for Firefox 61-

Answer 4

Use a WebTOPDF firefox extension its free and and No server processing. It will take screenshot of whole page.even include which is not shown currently on-screen (scrolling).This extension is for Windows only.Its open source.Its using HTML2Canvas.Its generates a PDF only.Yes i am the owner of it.