Because that allows you to capture a complete, scrollable website as a single png image. OS tools only let you capture the currently viewable area.

ah! thank you, that makes a lot of sense. I use Evernote's web clipper for similar functionality.

If you consider Firefox Screenshots from the perspective of a Support tool, this makes alot of sense. Customer wants to file a support ticket or bug report, needs to include a screenshot. Screenshot taken, they paste the link into the ticket, done. They never leave the browser.

Outside of the browser, fire up the screenshot tool, crop whatever you want to show, save it, upload it to imgur or website of choice, attach or paste it.

I would liken the tool to Fedora's amazing fpaste tool, which you invoke via the following:

    foo | fpaste

fpaste takes the output of the `foo` command, sends it to a log file, automatically uploads it to a fedora server, and returns a minified URL that can be copied and pasted to the developer. It is an amazing tool, provided you know what it's doing.

fpaste also takes several safety precautions such as static URLs that delete themselves after 24 hours.

So I can see Screenshots being very useful for that purpose. It just needs to be better about disclosing what it's doing.

    cat verysecret.csv | cut -f 1 -d ' ' |fpaste -z -x -a

Wait, I meant paste.

You can try it for yourself in the browser: https://paste.fedoraproject.org/

If you accidentally fpasted something sensitive, you're given a deactivation link to remove it immediately.

Well, once you learn the backwards behavior of the buttons, nothing will get sent to mozilla (click "download" and not "save"). I thought it would be cool to save the entire page, even the parts that aren't in view (difficult with operating-system screenshot tools). (I couldn't figure out how to make this work.) And yes, you can right-click on the screenshot button and remove it from the toolbar (I don't think this would disable the entire feature, maybe there's a keyboard shortcut to activate it as well).

This is one of the best features of new Firefox for me. Normally I had to start up gimp, select an option, set few seconds timeout, grap the screenshot, and then edit it to show only the part I wanted.

Screenshot in firefox is aware of the page, you can select the appropriate html tag visually.

Actually I thought they removed it in recent Nighlty and was looking for it, after few days I found it in the triple dot, (just next to the start and pocket icons).

Note that there are a ton of ways to grab screenshots on linux that don't require you to start gimp. (I'm assuming you're using linux since you mentioned gimp; yes I know it runs on other platforms, but those platforms also have other, much easier ways to capture screenshots). On linux workstations I usually have one of those quake-console things so I hit whatever key combination triggers it (on my mac it's double-ctrl, brings down iterm 2 window). From any console you can use the "import" command (part of imagemagick package). This lets you grab the whole screen, a single window, or an arbitrary rectangle. `import foo.png` Gnome has its own screenshot tool, and there are likely dozens of other packages that do the same thing.