Firefox DevTools MCP vs Gecko MCP
A side-by-side look at the Firefox DevTools MCP and Gecko MCP MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Firefox DevTools MCP for browser automation work as a local process; choose Gecko MCP for browser automation as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Firefox DevTools MCP when
- You need dedicated capabilities in the Browser Automation domain.
- You prefer a local stdio subprocess transport.
- You want tools like
list_pages, new_page, navigate_page.
Choose Gecko MCP when
- You need dedicated capabilities in the Browser Automation domain.
- You prefer a local stdio subprocess transport.
- You want tools like
list_tabs, open_tab, get_active_tab.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Browser Automation | Browser Automation |
| Quality signal | 69/100 · Great | 57/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | Not declared |
| Pricing | Not declared | Not declared |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 506 | 2 |
| Directory activity | 2 views 0 installs 0 upvotes | 1 views 0 installs 0 upvotes |
| Tools | 35 | 41 |
| Full listing | View Firefox DevTools MCP | View Gecko MCP |
Tools & capabilities
Firefox DevTools MCP tools 35
list_pagesList open tabs (index, title, URL). Selected tab is marked.new_pageOpen new tab at URL. Returns tab index.navigate_pageNavigate selected tab to URL.select_pageSelect active tab by index, URL, or title. Index takes precedence.close_pageClose tab by index.get_page_textGet the visible text of the page (document.body.innerText). Caps at maxLength (default 20000 chars); saveTo saves the full text to a file.take_snapshotCapture DOM snapshot with stable UIDs. A UID stays valid across snapshots until its element is removed or the page navigates. Output caps at maxLines (default 100); scope with selector or dump the full tree with saveTo.resolve_uid_to_selectorResolve UID to CSS selector. Fails if the element is gone.clear_snapshotClear snapshot UIDs. Usually not needed.click_by_uidClick element by UID. Set dblClick for double-click.hover_by_uidHover over element by UID.fill_by_uidFill text input/textarea by UID.- +23 more on the listing page
Gecko MCP tools 41
list_tabsList all open tabs in Floorp (title, URL, browserId, and whether each is active or pinned). Use the browserId to target other tools.open_tabOpen a URL in a new Floorp tab.get_active_tabReturn the active tab's title, URL and browserId. Note: with multiple browser windows open, 'active' is ambiguous — prefer the browserId returned by open_tab, or pick from list_tabs.navigate_tabNavigate a tab to a new URL. Targets the active tab unless a browserId is given.close_tabClose a tab by its browserId (from list_tabs).read_pageRead a tab's content. Returns clean Markdown by default; can also return raw HTML or the accessibility tree. Output is capped (default 25 KB) to protect the context — to LOCATE a specific element use `find` (cheaper) instead. Targets the active tab unless a browserId is given.screenshotTake a screenshot of a tab and return it as a PNG image. Targets the active tab unless a browserId is given.findLocate elements on a tab by visible text and/or tag and get a ready-to-use CSS `selector` for each — one fast call that searches the page server-side and returns ~1 KB instead of the whole HTML. Use this INSTEAD of read_page to find a button, link, or field, then pass the returned selector straight to click/type/etc. Provide `text`, `tag`, or both. Active tab unless browserId given.clickClick an element by CSS selector OR by a `ref` (fingerprint) from `snapshot`. Auto-scrolls the element into view first (fixes off-screen 'not actionable'). Targets the active tab unless a browserId is given.snapshotCapture a structured snapshot of a tab: clean Markdown with inline fingerprint refs (`<!--fp:...-->`) and an 'Element Selector Map' (fp | tag | text). Use this instead of read_page+grep to locate elements, then pass a `ref` to `click`. Targets the active tab unless a browserId is given.type_textType text into an input or textarea by CSS selector (clears it first by default). Targets the active tab unless a browserId is given.fill_formFill multiple form fields at once. `fields` maps CSS selectors (or field names) to values. Targets the active tab unless a browserId is given.- +29 more on the listing page
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Firefox DevTools MCP
{
"mcpServers": {
"firefox-devtools-mcp": {
"command": "npx",
"args": [
"-y",
"@mozilla/firefox-devtools-mcp@latest"
]
}
}
}
Gecko MCP
{
"mcpServers": {
"gecko-mcp": {
"command": "npx",
"args": [
"-y",
"gecko-mcp"
]
}
}
}
Frequently asked questions
Firefox DevTools MCP is categorized under Browser Automation and uses a local stdio subprocess. Gecko MCP belongs to Browser Automation and uses a local stdio subprocess. Pick Firefox DevTools MCP for browser automation work and Gecko MCP for browser automation.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Firefox DevTools MCP has no declared pricing — check the project's own site. Gecko MCP has no declared pricing — check the project's own site. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add firefox-devtools-mcp and gecko-mcp as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Firefox DevTools MCP has a quality signal of 69/100 (Great) with 2 views, 0 installs and 506 GitHub stars. Gecko MCP has 57/100 (Good) with 1 views, 0 installs and 2 GitHub stars.