marionette-mcp
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| FX_MCP_FILE_ROOTS | No | Comma-separated roots that fx_upload/fx_screenshot may touch | /tmp |
| FX_MARIONETTE_HOST | No | Marionette endpoint (loopback only, by design) | 127.0.0.1 |
| FX_MARIONETTE_PORT | No | Firefox's --marionette port | 2828 |
Instructions
Guidance the server publishes about itself, which clients place ahead of the tool catalog so the model reads it before choosing anything.
This server publishes no instructions, or was last inspected before Glama recorded them.
Capabilities
Features and capabilities supported by this server
Protocol revision2025-11-25
| Capability | Details |
|---|---|
| tools | {
"listChanged": false
} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| fx_statusB | Health: connection, session, current page, navigator.webdriver flag |
| fx_navigateC | Navigate the active tab to a URL |
| fx_pageA | Current URL and title |
| fx_snapshotB | Interactive-element map with refs (use refs in fx_click/fx_type/...) |
| fx_clickB | Click element by ref (from fx_snapshot) or CSS selector |
| fx_typeA | Type text into element (clears first unless keep=true) |
| fx_selectB | Set by option value or visible label |
| fx_toggleC | Set checkbox/radio state |
| fx_uploadB | Set a file input value (raw-path sendKeys); path must be under FX_MCP_FILE_ROOTS |
| fx_evalA | Execute JS in the page (script = function body, may return a value) |
| fx_waitA | Wait until visible text (or CSS selector exists). Default 10s, max 30s |
| fx_screenshotC | View PNG to a file under an allowed root (or explicit allowed path) |
| fx_windowsB | List windows (focused marked) |
| fx_windowC | Switch active window by handle |
| fx_alert_stateB | Text of an open native dialog |
| fx_alert_acceptA | Accept (OK) the open native dialog |
| fx_alert_dismissA | Dismiss (Cancel) the open native dialog |
| fx_cookiesA | Cookies of the current origin (names/domains only) |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
No prompts | |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
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