







Download AT Protocol Handler for Firefox. AT Protocol Handler This extension lets you handle and open at:// URLs seamlessly in your browser by listing compatible sites. Originally developed for Chrome, this version supports Firefox with full protocol handler integration.
AT Protocol Handler – Get this Extension for 🦊 Firefox (en-US)
Download AT Protocol Handler for Firefox. AT Protocol Handler This extension lets you handle and open at:// URLs seamlessly in your browser by listing compatible sites. Originally developed for Chrome, this version supports Firefox with full protocol handler integration.

PDSls Redirector – Get this Extension for 🦊 Firefox (en-US)
Download PDSls Redirector for Firefox. Open the PDSls page corresponding to an AT-Protocol compatible website.

at://wormhole – Get this Extension for 🦊 Firefox (en-US)
Download at://wormhole for Firefox. Open at:// links or active tab URL in various AT Protocol tools and Bluesky clients.

Aturi – Get this Extension for 🦊 Firefox (en-US)
Download Aturi for Firefox. Fast travel around the Atmosphere — switch between apps, auto-redirect to your Bluesky client of choice, and copy universal links.

Protocol Handler Registration via Browser Extensions – make everything intensely
Custom URL schemes have traditionally served as an integration bridge between the browser and external capabilities. Schemes such as mailto: and tel: allow navigation to trigger actions beyond ordinary HTTP resource retrieval. The HTML Standard formalizes this mechanism through the Custom Scheme Handlers API, which enables websites to register themselves as handlers for specific URL schemes.
New Custom Handlers component for Chrome – make everything intensely
The HTML Standard section on Custom Handlers describes the procedure to register custom protocol handlers for URLs with specific schemes. When a URL is followed, the protocol dictates which part of the system handles it by consulting registries. In some cases, handlers may fall to the OS level and and launch a desktop application (eg. mailto:// may launch a native application) or, the browser may redirect the request to a different HTTP(S) URL (eg. mailto:// can go to gmail).
substandard - Chrome Web Store
Detect and subscribe to standard.site publications on the AT Protocol.
README
This is a browser extension that provides “wormhole” navigation between different AT Protocol/Bluesky services inspired by Dame’s Shortcut. The extension transforms URLs and identifiers from one service to equivalent URLs on other services.
Margin – Get this Extension for 🦊 Firefox (en-US)
Download Margin for Firefox. Write in the margins of the web. Annotate any URL with AT Protocol.

Margin – Get this Extension for 🦊 Firefox (en-US)
Download Margin for Firefox. Write in the margins of the web. Annotate any URL with AT Protocol.

Margin – Get this Extension for 🦊 Firefox (en-US)
Download Margin for Firefox. Write in the margins of the web. Annotate any URL with AT Protocol.

@atpi.at is live. A tiny set of tools and integrations to resolve AT Protocol URLs and preview atproto JSON data! - Direct URL prefixing (atpi.at//...) - npm pkg - Chrome Extension - VS Code Extension and... some fun ones! Check out: docs.atpi.at It’s not just an API. It’s ATPI. GET it?
ATPI - AT Protocol API
docs.atpi.atImportant piece of multi-protocol support in browsers! Thanks to much work from Javi, and funding from @ipfs.tech. HEY NOW, settle down - a ways to go: - can only redirect to URLs/paths - no Safari - off by default in Chrome (for now) - only allow-listed schemes unprefixed Step by step...
Javier Fernandez
Blog post about a new Chromium feature I've been working on to allow Web Extensions register protocol handlers just declaring them in the Manifest. blogs.igalia.com/jfernandez/2026/03/24/protoco…
Aturi is evolving! We’re now a browser extension for Fast Traveling around the Atmosphere: • Auto-redirect to favorite clients • Quickly switch apps • Copy universal links Automatically open @bsky.app links in clients like @anisota.net, @blackskyweb.xyz, @reddwarf.app, & more! Download: aturi.to
at:// links not opening in Firefox? Now they do ☄️ I made a tiny extension that redirects @atproto.com URIs to your preferred AppView — starting with @bsky.app @blackskyweb.xyz and @bluenotes.social 🩷 Works with posts, feeds, lists, starter packs and both @standard.site publication and documents 🔥
cuducos.me/at-url
tangled.org