Windows · Open Source · GPL v2

A lightweight browser
you can actually reshape.

K-MeleonCCF pairs a native Windows shell with the Goanna engine, a Lua scripting layer that hot-reloads on save, and a built-in AI agent that drives the page for you. No Electron. No telemetry. No 4 GB on disk before you've opened a tab.

Download for Windows x64 · ~50 MB See what's inside

~50 MB installed x64 native, no runtime Goanna 6 engine

K-Meleon Docs Source

🔒 https://k-meleon.local/

-- lua/autoload/hello.lua  (save → live in ~150ms)
function on_compose()
  km.NavigateTo("https://mail.example.com/compose", OPEN_NEWTAB)
  agent.say("Drafting your reply...")
end

-- the change is live; no restart, no rebuild.

~150ms

Lua hot-reload
on every save

50+

Built-in toolbar &
menu commands

Bundled C++
plugins

GPLv2

Free, open source,
auditable

What's inside

Small, fast, and yours to bend.

Every part is open: the C++ shell, the engine integration, the ~40 Lua scripts that build the UI. Change anything; save; see the result before your finger leaves the keyboard.

⚡

Genuinely lightweight

Native MFC shell, x64 binary, no Electron, no Chromium overlay. Idle RAM is measured in tens of megabytes, not hundreds.

🦎

Goanna 6 engine

Built on roytam1's actively maintained Goanna 6 (the Pale Moon lineage of UXP), with K-Meleon's XPCOM embedding so plugins keep working.

🪄

Hot-reload scripting

Edit any lua/*.lua and a directory watcher re-parses it in place — no restart, no re-login. Even the Preferences dialog rebuilds itself.

🤖

AI agent sidebar

Describe a task in plain English; the agent reads the page, clicks, types, and reports back. Bring your own DeepSeek key.

🛡️

Live adblock

Adblock Plus syntax. Edit rules in Preferences or just drag a link image to "block." The kplugin watches the file and re-parses on save.

🖱️

Mouse gestures

Right-drag to navigate, with an optional orange trail. Left-drag a link in any direction to open it in a background or foreground tab.

🗂️

Real tabs

Native tab bar, double-click empty space for a new tab, drag-to- close, configurable middle/right-click behaviour. Bookmarks, sessions, and history all built in.

🔒

No telemetry, no phone-home

Safe-browsing pings disabled by default, no usage stats, no "improve our product" toggles hidden behind menus. It just runs.

Built-in agent

A browser that
can drive itself.

Open the sidebar, type what you want — "find the cheapest flight from Chicago to LA on Google Flights" — and watch the agent navigate, fill forms, and follow links until it has your answer.

Reads condensed page state on every step
One action per think — navigate, click, type, scroll, wait
Runs on its own thread so the UI stays smooth
Pluggable: any OpenAI-compatible endpoint works

K-Meleon Agent ● running

Agent K-MeleonCCF Agent ready.
Describe a task — for example find the cheapest flight from Chicago to LA on Google Flights.

You open my inbox and draft a reply to the latest message

→ navigate https://mail.example.com/inbox

→ click [data-thread="newest"] — OK

→ click [gh="r"] — OK

Agent Reply composer is open. What should I write?

Scripting layer

Customize without
a build step.

The whole UI — toolbars, menus, the Preferences dialog, the right-click context menu — is built from ~40 Lua scripts in your profile. Add a button, redefine a keybinding, or write a brand-new feature: save the file and it's live before you finish blinking.

Lua 5.1 with full file/network/DOM access
30+ km.* bindings exposed to scripts
Live reload via ReadDirectoryChangesW
Errors logged, never crash the browser

lua/autoload/quickopen.lua saved · reloaded 132 ms ago

-- Ctrl+Shift+G: jump to GitHub for the current page's repo.
function github_for_current_tab()
  local _, url = km.GetDocInfo(hwnd)
  local host, path = url:match("^https?://([^/]+)(/.*)")
  if host == "npmjs.com" then
    local pkg = path:match("/package/(.+)")
    km.NavigateTo("https://github.com/search?q=" .. pkg, OPEN_NEWTAB)
  end
end

setkey("CTRL SHIFT G", "github_for_current_tab")