@mozilla/firefox-devtools-mcp

What changed

Changed 2026-10-16 11:12 UTC

1 tool added.

+ tool added: print_page

Changed 2026-10-05 14:18 UTC

2 descriptions rewritten, 2 schema or annotation changes with the description left byte-identical, 3 tools added, 1 tool removed.

+ tool added: close_firefox_session

--- pinned/navigate_page
+++ observed/navigate_page
  {
    "annotations": {
      "readOnlyHint": false
+       },
+       "wait": {
+         "description": "When to return: 'none' (navigation started), 'interactive' (DOMContentLoaded), 'complete' (load event fired, including subresources). Omit for the default: 'interactive' for http/https/data/blob/file, 'none' for other schemes. Use 'complete' when the page must be fully loaded, e.g. before stopping a performance recording.",
+         "enum": [
+           "none",
+           "interactive",
+           "complete"
+         ],
+         "type": "string"
        }
      },
      "required": [

--- pinned/new_page
+++ observed/new_page
  {
    "annotations": {
      "readOnlyHint": false
+       },
+       "wait": {
+         "description": "When to return: 'none' (navigation started), 'interactive' (DOMContentLoaded), 'complete' (load event fired, including subresources). Omit for the default: 'interactive' for http/https/data/blob/file, 'none' for other schemes. Use 'complete' when the page must be fully loaded, e.g. before stopping a performance recording.",
+         "enum": [
+           "none",
+           "interactive",
+           "complete"
+         ],
+         "type": "string"
        }
      },
      "required": [

+ tool added: press_key

--- pinned/screenshot_page
+++ observed/screenshot_page
  {
    "annotations": {
      "readOnlyHint": true
-   "description": "Capture page screenshot as base64 PNG.",
+   "description": "Capture viewport screenshot as base64 PNG. Set fullPage for the whole scrollable document.",
    "inputSchema": {
      "properties": {
+       "fullPage": {
+         "description": "Capture the whole scrollable document (default: false)",
+         "type": "boolean"
+       },
        "saveTo": {
          "description": "Save the screenshot to a file instead of returning it as image data in the response. Pass a file path, an existing directory (generated file inside), or true (generated file under ~/.firefox-devtools-mcp/output/). Relative paths resolve against the current working directory.",
          "type": [

--- pinned/set_download_behavior
+++ observed/set_download_behavior
  {
-   "description": "Control how downloads are handled: allow (save silently to the default download directory), deny (cancel), or reset to default. Avoids the native save-file dialog. Requires a recent Firefox.",
+   "description": "Control how downloads are handled: allow (save to a destination folder), deny (cancel), or reset to default. Avoids the native save-file dialog. Requires a recent Firefox.",
    "inputSchema": {
      "properties": {
        "behavior": {
-         "description": "'allowed' saves downloads automatically, 'denied' cancels them, 'default' resets to the browser default",
+         "description": "'allowed' saves downloads to `downloadFolder`, 'denied' cancels them, 'default' resets to the browser default",
          "enum": [
            "allowed",
            "denied",
+       },
+       "downloadFolder": {
+         "description": "Path to the folder where downloads should be stored, created if missing. Only used for behavior='allowed', where it defaults to ~/.firefox-devtools-mcp/output/downloads. Relative paths resolve against the current working directory.",
+         "type": "string"
        }
      },
      "required": [

+ tool added: type_text

tool removed: restart_firefox

Current tools

Watch this server yourself

If you run this server, put the proxy in front of it. It pins these exact fingerprints on first connect and stops the session if they move.

npx -y mcp-pin@0.2.3 -- <your @mozilla/firefox-devtools-mcp command>

Or subscribe to this page's RSS feed to be told when it changes.

Badge

The badge states one fact about time and nothing else. It never claims a server is safe.

[![mcp-pin](https://mcp-pin.gautamkhosla.com/badge/75633492483fa7bc.svg)](https://mcp-pin.gautamkhosla.com/servers/75633492483fa7bc.html)