Describe the feature:
Add a new Juggler Page domain method that enumerates the event listeners attached to a DOM node, by wrapping the existing nsIEventListenerService.getListenerInfoFor(node) XPCOM service:
Page.getEventListenersForNode({ frameId, objectId })
→ { listeners: [
{ type, capturing, allowsUntrusted, inSystemEventGroup },
...
]
}
Field names mirror Firefox's nsIEventListenerInfo interface (dom/events/nsIEventListenerService.idl) verbatim so the mapping from the underlying XPCOM service is unambiguous. The DOM-level passive flag is intentionally omitted because Firefox does not expose it through this interface.
The patch is purely additive — no existing methods or types are touched. ~60 lines across three files in additions/juggler/:
protocol/Protocol.js — declare the method + add pageTypes.EventListenerInfoprotocol/PageHandler.js — one-line dispatch to the content sidecontent/PageAgent.js — register + implement via nsIEventListenerService
I have a working patch (verified locally on Camoufox 146.0.1-beta.25 — Protocol.js validation accepts the new schema, the build runs cleanly, and the wire stack accepts Juggler messages with the patch in place) and will open a PR linking this issue.
Is your feature request related to a problem? Please describe.
The recent surge of LLM-agent browser tooling — Browser-Use, chrome-devtools-mcp, Vercel's agent-browser, browserbase, and others — all need to discover non-ARIA interactive elements like <div onclick> or <span data-action> to drive realistic agent ↔ web interactions. Pure accessibility-tree walks miss these elements: the AX tree marks them as role=generic, so the agent sees a static page when the user sees a clickable surface.
Chrome's DevTools Runtime context has long exposed a getEventListeners(el) helper for exactly this case; bringing parity to Firefox-flavored automation through Juggler closes the gap and makes Camoufox a viable backend for agent stacks that today only target Chromium.
The XPCOM service this wraps is stable since 2008 (https://bugzilla.mozilla.org/show_bug.cgi?id=524674). Adding the binding is a thin, low-risk change.
Describe the feature:
Add a new Juggler
Pagedomain method that enumerates the event listeners attached to a DOM node, by wrapping the existingnsIEventListenerService.getListenerInfoFor(node)XPCOM service:Field names mirror Firefox's
nsIEventListenerInfointerface (dom/events/nsIEventListenerService.idl) verbatim so the mapping from the underlying XPCOM service is unambiguous. The DOM-levelpassiveflag is intentionally omitted because Firefox does not expose it through this interface.The patch is purely additive — no existing methods or types are touched. ~60 lines across three files in
additions/juggler/:protocol/Protocol.js— declare the method + addpageTypes.EventListenerInfoprotocol/PageHandler.js— one-line dispatch to the content sidecontent/PageAgent.js— register + implement viansIEventListenerServiceI have a working patch (verified locally on Camoufox 146.0.1-beta.25 — Protocol.js validation accepts the new schema, the build runs cleanly, and the wire stack accepts Juggler messages with the patch in place) and will open a PR linking this issue.
Is your feature request related to a problem? Please describe.
The recent surge of LLM-agent browser tooling — Browser-Use, chrome-devtools-mcp, Vercel's agent-browser, browserbase, and others — all need to discover non-ARIA interactive elements like
<div onclick>or<span data-action>to drive realistic agent ↔ web interactions. Pure accessibility-tree walks miss these elements: the AX tree marks them asrole=generic, so the agent sees a static page when the user sees a clickable surface.Chrome's DevTools Runtime context has long exposed a
getEventListeners(el)helper for exactly this case; bringing parity to Firefox-flavored automation through Juggler closes the gap and makes Camoufox a viable backend for agent stacks that today only target Chromium.The XPCOM service this wraps is stable since 2008 (https://bugzilla.mozilla.org/show_bug.cgi?id=524674). Adding the binding is a thin, low-risk change.