head to head · open source
chrome-devtools-mcp vs Mercury
chrome-devtools-mcp has 54,665 GitHub stars, 5,250 forks, 109 open issues and last shipped yesterday. Mercury has 1,542 stars, 43 forks, 92 open issues and last shipped 3 months ago. chrome-devtools-mcp leads on adoption by 3,445% (54,665 vs 1,542 stars). chrome-devtools-mcp is written in TypeScript under Apache-2.0; Mercury is written in JavaScript under MPL-2.0. chrome-devtools-mcp has attracted 10% as many forks as stars, Mercury 3%. chrome-devtools-mcp was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (browser), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| chrome-devtools-mcp | Mercury | |
|---|---|---|
| GitHub stars | ★ 55K | ★ 1.5K |
| License | Apache-2.0 | MPL-2.0 |
| Written in | TypeScript | JavaScript |
| Last push | 2026-11-02 | 2026-08-09 |
| Forks | ⑂ 5.3K | ⑂ 43 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick chrome-devtools-mcp if
- You weight community size — 55K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Mercury if
- You want the Mercury feature set and don't need the biggest community
- You prefer the MPL-2.0 license terms
- Your stack matches JavaScript
- You evaluated both and Mercury fits your workflow better
About chrome-devtools-mcp
Chrome DevTools for agents Chrome DevTools for agents ( chrome devtools mcp ) lets your coding agent (such as Antigravity, Claude, Cursor or Copilot) control and inspect a live Chrome browser. It acts as a Model Context Protocol (MCP) server, giving your AI coding assistant access to the full power of Chrome DevTools for reliable automation, in depth debugging, and performance analysis. A [CLI][cli] is also provided for use without MCP. [Tool reference][tool reference] [Changelog][changelog] [Contributing][contributing] [Troubleshooting][troubleshooting] [Design Principles][design principles] Key features Get…
read the full chrome-devtools-mcp overview →
About Mercury
Mercury Browser Firefox fork with compiler optimizations and patches from Librewolf, Waterfox, Ghostery, and BetterFox. It aims to be the Firefox equivalent of my main project: Thorium (a Chromium fork). Patches See PATCHES.md Bugs See BUGS.md Building See BUILDING.md and DEBUGGING.md.
read the full Mercury overview →
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Frequently asked questions
Is chrome-devtools-mcp or Mercury more popular?
chrome-devtools-mcp has 54,665 GitHub stars and Mercury has 1,542. chrome-devtools-mcp has the larger community by that measure.
Are chrome-devtools-mcp and Mercury free?
Both are open source. chrome-devtools-mcp is licensed under Apache-2.0 and Mercury under MPL-2.0. Neither carries a licence fee.
What is the difference between chrome-devtools-mcp and Mercury?
chrome-devtools-mcp is written in TypeScript and Mercury in JavaScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, chrome-devtools-mcp or Mercury?
Choose chrome-devtools-mcp if you want the larger community (54,665 stars) or its Apache-2.0 licence terms. Choose Mercury if its feature set, stack or MPL-2.0 licence fits better. Both are self-hostable.