Firefox DevTools MCP vs Selenium MCP
A side-by-side look at the Firefox DevTools MCP and Selenium 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 Selenium 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 Selenium MCP when
- You need dedicated capabilities in the Browser Automation domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
- You want tools like
start_browser, navigate, take_screenshot.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Browser Automation | Browser Automation |
| Quality signal | 69/100 · Great | 61/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | No auth required |
| Pricing | Not declared | Free |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 506 | 2 |
| Directory activity | 3 views 0 installs 0 upvotes | 7 views 0 installs 0 upvotes |
| Tools | 35 | 85 |
| Full listing | View Firefox DevTools MCP | View Selenium 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
Selenium MCP tools 85
start_browserStart a browser session. Optional — any tool will auto-start Chrome if no browser is open. Use this to choose Firefox, enable headless mode, or set a custom window size.navigateNavigate the browser to a URL.take_screenshotTake a screenshot and return it as base64.get_page_sourceReturn the current page HTML source.get_page_titleReturn the current page title.get_current_urlReturn the current URL.close_browserClose and quit the browser session.go_backNavigate back in browser history.go_forwardNavigate forward in browser history.refreshRefresh the current page.execute_scriptExecute JavaScript in the browser.switch_to_windowSwitch to a browser window/tab by index.- +73 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"
]
}
}
}
Selenium MCP
{
"mcpServers": {
"seleniumboot-selenium-mcp": {
"command": "uvx",
"args": [
"seleniumboot-mcp"
]
}
}
}
Frequently asked questions
Firefox DevTools MCP is categorized under Browser Automation and uses a local stdio subprocess. Selenium MCP belongs to Browser Automation and uses a local stdio subprocess. Pick Firefox DevTools MCP for browser automation work and Selenium 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. Selenium MCP is listed as free. Auth: no auth required. 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 seleniumboot-selenium-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 3 views, 0 installs and 506 GitHub stars. Selenium MCP has 61/100 (Good) with 7 views, 0 installs and 2 GitHub stars.
