diff --git a/browser/zen/zen.go b/browser/zen/zen.go
new file mode 100644
index 0000000..375ab5e
--- /dev/null
+++ b/browser/zen/zen.go
@@ -0,0 +1,22 @@
+// Zen (https://zen-browser.app) is a Firefox fork that keeps its own
+// profile tree, separate from Firefox's, but reuses Firefox's cookies.sqlite
+// and sessionstore formats verbatim.
+package zen
+
+import (
+	"github.com/browserutils/kooky"
+	"github.com/browserutils/kooky/internal/firefox"
+	"github.com/browserutils/kooky/internal/firefox/find"
+)
+
+type zenFinder struct{}
+
+var _ kooky.CookieStoreFinder = (*zenFinder)(nil)
+
+func init() {
+	kooky.RegisterFinder(`zen`, &zenFinder{})
+}
+
+func (f *zenFinder) FindCookieStores() kooky.CookieStoreSeq {
+	return firefox.CookieStoresForProfiles(find.FindZenProfiles())
+}
diff --git a/internal/firefox/find/find.go b/internal/firefox/find/find.go
index b5adb58..1f10530 100644
--- a/internal/firefox/find/find.go
+++ b/internal/firefox/find/find.go
@@ -22,6 +22,14 @@ func FindFirefoxProfiles() iter.Seq2[Profile, error] {
 	return FindProfiles(firefoxRoots, `firefox`)
 }
 
+// FindZenProfiles returns all Zen Browser (https://zen-browser.app) profiles
+// from known root directories. Zen is a Firefox fork that keeps its own
+// profile tree — separate from Firefox's — but writes profiles.ini in the
+// same format, so it reuses FindProfiles/FindProfilesInRoot as-is.
+func FindZenProfiles() iter.Seq2[Profile, error] {
+	return FindProfiles(zenRoots, `zen`)
+}
+
 // FindProfilesInRoot parses a single profiles.ini from rootDir
 // and returns the discovered profiles.
 func FindProfilesInRoot(rootDir, browserName string) ([]Profile, error) {
diff --git a/internal/firefox/find/zen_darwin.go b/internal/firefox/find/zen_darwin.go
new file mode 100644
index 0000000..d990896
--- /dev/null
+++ b/internal/firefox/find/zen_darwin.go
@@ -0,0 +1,20 @@
+//go:build darwin && !ios
+
+package find
+
+import (
+	"os"
+	"path/filepath"
+)
+
+func zenRoots(yield func(string, error) bool) {
+	// "$HOME/Library/Application Support/zen"
+	cfgDir, err := os.UserConfigDir()
+	if err != nil {
+		_ = yield(``, err)
+		return
+	}
+	if !yield(filepath.Join(cfgDir, `zen`), nil) {
+		return
+	}
+}
diff --git a/internal/firefox/find/zen_other.go b/internal/firefox/find/zen_other.go
new file mode 100644
index 0000000..1250675
--- /dev/null
+++ b/internal/firefox/find/zen_other.go
@@ -0,0 +1,5 @@
+//go:build !windows && !linux
+
+package find
+
+func windowsZenRoots(yield func(string, error) bool) {}
diff --git a/internal/firefox/find/zen_others.go b/internal/firefox/find/zen_others.go
new file mode 100644
index 0000000..61bcc16
--- /dev/null
+++ b/internal/firefox/find/zen_others.go
@@ -0,0 +1,7 @@
+//go:build plan9 || android || ios || js || aix
+
+package find
+
+import "errors"
+
+func zenRoots(yield func(string, error) bool) { yield(``, errors.New(`not implemented`)) }
diff --git a/internal/firefox/find/zen_unix.go b/internal/firefox/find/zen_unix.go
new file mode 100644
index 0000000..9353cc3
--- /dev/null
+++ b/internal/firefox/find/zen_unix.go
@@ -0,0 +1,45 @@
+//go:build !windows && !darwin && !plan9 && !android && !js && !aix
+
+package find
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/browserutils/kooky/internal/windowsx"
+)
+
+func zenRoots(yield func(string, error) bool) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		_ = yield(``, err)
+		return
+	}
+	// tarball / AUR install, current default:
+	// https://docs.zen-browser.app/guides/install-linux
+	if !yield(filepath.Join(home, `.zen`), nil) {
+		return
+	}
+	// Flatpak (same doc)
+	if !yield(filepath.Join(home, `.var`, `app`, `app.zen_browser.zen`, `.zen`), nil) {
+		return
+	}
+	// Newer XDG Base Directory-following builds
+	// (zen-browser/desktop#12366) — gated behind the Twilight channel as of
+	// this writing, kept here so this doesn't need a follow-up once it
+	// reaches the stable channel.
+	if cfgDir, err := os.UserConfigDir(); err == nil {
+		if !yield(filepath.Join(cfgDir, `zen`), nil) {
+			return
+		}
+	}
+	// on WSL Linux add Windows paths
+	if !windowsx.IsWSL() {
+		return
+	}
+	for r, err := range windowsZenRoots {
+		if !yield(r, err) {
+			return
+		}
+	}
+}
diff --git a/internal/firefox/find/zen_w.go b/internal/firefox/find/zen_w.go
new file mode 100644
index 0000000..6b11273
--- /dev/null
+++ b/internal/firefox/find/zen_w.go
@@ -0,0 +1,21 @@
+//go:build windows || linux
+
+package find
+
+import (
+	"path/filepath"
+
+	"github.com/browserutils/kooky/internal/windowsx"
+)
+
+// for Windows and WSL
+
+func windowsZenRoots(yield func(string, error) bool) {
+	// "%AppData%\zen" — https://docs.zen-browser.app/faq
+	appData, err := windowsx.AppData()
+	if err != nil {
+		_ = yield(``, err)
+		return
+	}
+	_ = yield(filepath.Join(appData, `zen`), nil)
+}
diff --git a/internal/firefox/find/zen_windows.go b/internal/firefox/find/zen_windows.go
new file mode 100644
index 0000000..f821adc
--- /dev/null
+++ b/internal/firefox/find/zen_windows.go
@@ -0,0 +1,5 @@
+//go:build windows
+
+package find
+
+var zenRoots = windowsZenRoots