firefox-devtools-mcp
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| START_URL | No | Open this URL on start | |
| FIREFOX_HEADLESS | No | Run without UI | |
| ACCEPT_INSECURE_CERTS | No | Ignore TLS errors |
Capabilities
Server capabilities have not been inspected yet.
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| list_pagesB | List open tabs (index, title, URL). Selected tab is marked. |
| new_pageC | Open new tab at URL. Returns tab index. |
| navigate_pageC | Navigate selected tab to URL. |
| select_pageA | Select active tab by index, URL, or title. Index takes precedence. |
| close_pageC | Close tab by index. |
| list_console_messagesC | List console messages. Supports filtering by level, time, text, source. |
| clear_console_messagesB | Clear collected console messages. |
| list_network_requestsB | List network requests. Returns IDs for get_network_request. |
| get_network_requestB | Get request details by ID. URL lookup as fallback. |
| take_snapshotA | Capture DOM snapshot with stable UIDs. Retake after navigation. |
| resolve_uid_to_selectorC | Resolve UID to CSS selector. Fails if stale. |
| clear_snapshotC | Clear snapshot cache. Usually not needed. |
| click_by_uidB | Click element by UID. Set dblClick for double-click. |
| hover_by_uidC | Hover over element by UID. |
| fill_by_uidC | Fill text input/textarea by UID. |
| drag_by_uid_to_uidC | Drag element to another (HTML5 drag events). |
| fill_form_by_uidC | Fill multiple form fields at once. |
| upload_file_by_uidC | Upload file to file input by UID. |
| screenshot_pageB | Capture page screenshot as base64 PNG. |
| screenshot_by_uidC | Capture element screenshot by UID as base64 PNG. |
| accept_dialogC | Accept browser dialog. Provide promptText for prompts. |
| dismiss_dialogB | Dismiss browser dialog. |
| navigate_historyC | Navigate history back/forward. UIDs become stale. |
| set_viewport_sizeC | Set viewport dimensions in pixels. |
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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