YourImageShare Capture: Screenshot, Annotate, and Share, All in Firefox

Screenshots are usually the fastest part of getting help, reporting a bug, or explaining something to a colleague, right up until you have to do something with the file afterward. Save it somewhere, remember where you saved it, open a new tab, find the upload button, wait, copy a link, close the tab. The capture takes a second. Everything after it takes longer than it should. YourImageShare Capture, a new extension for Firefox, is built to remove that second half of the job entirely.

It is available now on addons.mozilla.org, works on desktop Firefox and Firefox for Android, and does not require an account to install. You only need an API key if you plan to use the one feature that talks to YourImageShare directly, publishing.

What the extension actually does

YourImageShare Capture gives you three ways to take a screenshot, each bound to its own keyboard shortcut so you never have to reach for a menu mid-task. Alt+Shift+1 grabs exactly what is visible on screen. Alt+Shift+2 lets you drag out a specific region, useful when only one part of a page matters. Alt+Shift+3 captures an entire page, including the parts below the fold, and stitches the whole thing together automatically into one image.

Once a capture is taken, it opens directly in a built-in editor rather than dumping a raw file on you. From there you can draw rectangles and ellipses, add arrows, write text directly on the image, freehand-sketch with a pen tool, and blur or redact anything that should not be visible, an email address, an account number, a name in a support ticket. Every action supports undo and redo, so there is no pressure to get an annotation perfect on the first try.

When the edit is done, you get three ways to finish: download the result as a PNG, copy it straight to your clipboard for pasting into a chat or a document, or publish it to YourImageShare and get a shareable link back in one click. All three live in the same toolbar, so the export step matches whatever you were already about to do with the image.

Why publishing is the interesting part

Downloading and clipboard copying are useful on their own, but they still leave you with a local file or a paste that only exists on one machine. Publishing is where the extension becomes an actual upload workflow rather than just an annotation tool. Add your API key once in the extension's Settings panel, and every capture from that point on can go straight from your screen to a real, shareable YourImageShare link without a browser tab, a login screen, or a drag-and-drop in between.

Under the hood, publishing uses the exact same /api endpoint documented on the API documentation page, the same one the JavaScript and Python libraries and the MCP server use. Nothing about the extension is a separate, special-cased path. If you already have an API key from another integration, ShareX or a script you wrote yourself, the same key works here.

Where it fits next to the other tools

YourImageShare already has upload paths for scripting, screenshot utilities, forums, and AI agents. This extension covers a gap none of those quite fill: capturing and annotating something on a page you are actively looking at, right now, without switching tools. ShareX, Flameshot, and Greenshot, covered in an earlier post, are excellent for people who already live inside those tools and want captures uploaded automatically, but none of them ship with an annotation editor built in, and none of them are a browser extension you install in a few clicks. If your screenshot habit lives mostly inside a browser tab already, whether that is documenting something on a website, marking up a page for a client, or capturing a long scrolling thread, the extension is a more natural fit than a separate desktop utility.

It also complements the REST API itself rather than replacing it. If you are automating uploads from a script, a build pipeline, or an AI agent through MCP, none of that changes. The extension is for the moments a person is looking at a screen and needs to capture, mark up, and share what is on it, by hand, right now.

A note on permissions

Browser extensions that touch screenshots need real permissions to work, and it is worth being upfront about what this one asks for. YourImageShare Capture requests download access, since saving a PNG is one of its export options, and it needs to read the content of the page you are capturing, which is unavoidable for any tool that takes a screenshot of that page. An account and an API key are entirely optional. If you only ever use the download or clipboard export, you can use the extension without ever creating one.

Getting started

Installing takes about as long as reading this paragraph. Grab the extension from addons.mozilla.org, pin it to your toolbar if you want quick access to the annotation editor, and try one of the three keyboard shortcuts on whatever page is open right now. If you want captures to publish directly to a shareable link, generate an API key from the API tab in My account and paste it into the extension's Settings panel. That is the entire setup, and it only needs doing once.

Full details on the underlying API, along with the JavaScript, Python, and MCP client libraries and the other screenshot integrations, are on the API documentation page. Whichever way a screenshot ends up getting to YourImageShare, script, desktop tool, or now a Firefox extension, the goal stays the same: get from capture to a working link with as few steps as possible in between.