diff --git a/CHANGELOG.md b/CHANGELOG.md
index a35216a..bbb58de 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ## [Unreleased]
 
 ### Added
+- add `window.url_opener` to configure the command used to open URLs
 - add `--maximized` and `--fullscreen` flags to start the window in that mode
 - persist and restore window size, maximized, and fullscreen state per session
 - REP (`CSI Ps b`): repeat the last printed character `Ps` times
diff --git a/README.md b/README.md
index c55a473..73f715f 100644
--- a/README.md
+++ b/README.md
@@ -159,6 +159,7 @@ width           = 800
 height          = 600
 title           = "mmterm"
 cursor_blink_ms = 500
+url_opener      = ""        # command to open URLs (empty = xdg-open/open)
 
 [shell]
 # program = "/bin/zsh"   # defaults to $SHELL
diff --git a/assets/config.toml b/assets/config.toml
index fbbd7ef..2bad5be 100644
--- a/assets/config.toml
+++ b/assets/config.toml
@@ -11,6 +11,9 @@ title           = "mmterm"
 cursor_blink_ms = 500
 inactive_dim    = 0.55
 detect_urls     = true
+# Command used to open URLs on click. Empty = system default (xdg-open/open).
+# url_opener = "firefox"
+url_opener      = ""
 
 [shell]
 # program = "/bin/zsh"
diff --git a/doc/SPEC.md b/doc/SPEC.md
index e3f10a6..e38f8d8 100644
--- a/doc/SPEC.md
+++ b/doc/SPEC.md
@@ -221,6 +221,7 @@ Screenshot capture is a two-step flow: region selection followed by a name promp
 | window | cursor_blink_ms | uint | `500` |
 | window | inactive_dim | float | `0.55` |
 | window | detect_urls | bool | `true` |
+| window | url_opener | string | `""` |
 | terminal | scrollback_lines | uint | `10000` (min 100) |
 | shell | program | string? | `$SHELL` |
 | logging | auto_log | bool | `false` |
diff --git a/src/config/config_test.rs b/src/config/config_test.rs
index 4bd6877..cecfea9 100644
--- a/src/config/config_test.rs
+++ b/src/config/config_test.rs
@@ -134,6 +134,44 @@ fn default_detect_urls_value() {
     assert!(default_detect_urls());
 }
 
+#[test]
+fn default_url_opener_is_empty() {
+    let cfg = Config::default();
+    assert!(cfg.window.url_opener.is_empty());
+}
+
+#[test]
+fn url_opener_default_applied_when_missing() {
+    let toml = r###"
+[font]
+family = "Mono"
+size = 14.0
+[window]
+width = 800
+height = 600
+title = "t"
+cursor_blink_ms = 500
+[shell]
+[colors]
+background = "#000000"
+foreground = "#ffffff"
+cursor = "#ffffff"
+selection = "#333333"
+palette = []
+"###;
+    let cfg: Config = toml::from_str(toml).expect("parse failed");
+    assert!(cfg.window.url_opener.is_empty());
+}
+
+#[test]
+fn config_roundtrip_preserves_url_opener() {
+    let mut cfg = Config::default();
+    cfg.window.url_opener = "firefox".to_string();
+    let s = toml::to_string_pretty(&cfg).expect("serialize failed");
+    let restored: Config = toml::from_str(&s).expect("deserialize failed");
+    assert_eq!(restored.window.url_opener, "firefox");
+}
+
 #[test]
 fn detect_urls_default_applied_when_missing() {
     let toml = r###"
diff --git a/src/config/mod.rs b/src/config/mod.rs
index 571c12a..f942f05 100644
--- a/src/config/mod.rs
+++ b/src/config/mod.rs
@@ -158,6 +158,10 @@ pub struct WindowConfig {
     pub inactive_dim: f32,
     #[serde(default = "default_detect_urls")]
     pub detect_urls: bool,
+    /// Command used to open URLs. Empty string means the per-OS default
+    /// (xdg-open on Linux, open on macOS, cmd /c start on Windows).
+    #[serde(default)]
+    pub url_opener: String,
 }
 
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
diff --git a/src/config/tui_config.rs b/src/config/tui_config.rs
index 6060b52..8fe2e00 100644
--- a/src/config/tui_config.rs
+++ b/src/config/tui_config.rs
@@ -33,6 +33,7 @@ const F_AUTO_UPDATE_CHECK: usize = 37;
 const F_AUTO_UPDATE_INSTALL: usize = 38;
 const F_SHELL_INTEGRATION: usize = 39;
 const F_DESKTOP_NOTIFICATIONS: usize = 40;
+const F_URL_OPENER: usize = 41;
 
 const PALETTE_LABELS: [&str; 16] = [
     "Palette 0  black",
@@ -302,6 +303,14 @@ impl ConfigPanel {
             section: None,
         });
 
+        fields.push(Field {
+            label: "URL Opener",
+            hint: "command to open URLs (empty = system default)",
+            value: cfg.window.url_opener.clone(),
+            kind: FieldKind::OptText,
+            section: None,
+        });
+
         let mut collapsed = HashSet::new();
         collapsed.insert("Palette");
 
@@ -678,6 +687,8 @@ impl ConfigPanel {
             .parse::<bool>()
             .map_err(|_| "Invalid desktop_notifications — use true or false")?;
 
+        let url_opener = get(F_URL_OPENER);
+
         Ok(Config {
             font: FontConfig { family, size },
             window: WindowConfig {
@@ -687,6 +698,7 @@ impl ConfigPanel {
                 cursor_blink_ms: blink_ms,
                 inactive_dim,
                 detect_urls,
+                url_opener,
             },
             shell: ShellConfig { program: shell },
             terminal: TerminalConfig { scrollback_lines },
diff --git a/src/config/tui_config_test.rs b/src/config/tui_config_test.rs
index 5f8381b..432ba35 100644
--- a/src/config/tui_config_test.rs
+++ b/src/config/tui_config_test.rs
@@ -10,8 +10,8 @@ fn make_panel() -> ConfigPanel {
 #[test]
 fn from_config_has_correct_field_count() {
     let panel = make_panel();
-    // 9 base + 1 scrollback + 2 logging + 1 theme + 4 colors + 16 palette + 1 status_bar + 3 general + 2 updates + 2 shell/notify = 41
-    assert_eq!(panel.fields.len(), 41);
+    // 9 base + 1 scrollback + 2 logging + 1 theme + 4 colors + 16 palette + 1 status_bar + 3 general + 2 updates + 2 shell/notify + 1 url_opener = 42
+    assert_eq!(panel.fields.len(), 42);
 }
 
 #[test]
@@ -305,6 +305,7 @@ fn distinct_config() -> Config {
             cursor_blink_ms: 523,
             inactive_dim: 0.42,
             detect_urls: true,
+            url_opener: "/usr/bin/xdg-open-x".into(),
         },
         shell: ShellConfig {
             program: Some("/bin/xyzsh".into()),
@@ -375,6 +376,7 @@ fn field_index_sanity() {
         F_AUTO_UPDATE_INSTALL,
         F_SHELL_INTEGRATION,
         F_DESKTOP_NOTIFICATIONS,
+        F_URL_OPENER,
     ];
     occupied.extend((0..16).map(|i| F_PALETTE + i));
     occupied.sort_unstable();
@@ -433,6 +435,18 @@ fn build_config_roundtrip_toggles_desktop_notifications() {
     }
 }
 
+#[test]
+fn build_config_roundtrips_url_opener() {
+    let mut panel = make_panel();
+    assert!(panel.fields[F_URL_OPENER].value.is_empty());
+    panel.fields[F_URL_OPENER].value = "firefox".to_string();
+    if let ConfigAction::Save(cfg) = panel.save() {
+        assert_eq!(cfg.window.url_opener, "firefox");
+    } else {
+        panic!("expected Save action");
+    }
+}
+
 #[test]
 fn build_config_shell_empty_becomes_none() {
     let mut panel = make_panel();
@@ -680,8 +694,8 @@ fn palette_collapsed_by_default() {
 #[test]
 fn visible_indices_hides_palette_body() {
     let panel = make_panel();
-    // 41 total - 15 palette body fields = 26 visible
-    assert_eq!(panel.visible_indices().len(), 26);
+    // 42 total - 15 palette body fields = 27 visible
+    assert_eq!(panel.visible_indices().len(), 27);
 }
 
 #[test]
@@ -690,7 +704,7 @@ fn toggle_on_palette_header_expands() {
     panel.selected = F_PALETTE;
     panel.toggle_collapse();
     assert!(!panel.collapsed.contains("Palette"));
-    assert_eq!(panel.visible_indices().len(), 41);
+    assert_eq!(panel.visible_indices().len(), 42);
 }
 
 #[test]
@@ -700,7 +714,7 @@ fn toggle_twice_restores_collapsed() {
     panel.toggle_collapse();
     panel.toggle_collapse();
     assert!(panel.collapsed.contains("Palette"));
-    assert_eq!(panel.visible_indices().len(), 26);
+    assert_eq!(panel.visible_indices().len(), 27);
 }
 
 #[test]
@@ -755,10 +769,10 @@ fn move_up_skips_collapsed_palette() {
 #[test]
 fn move_down_at_last_visible_clamps() {
     let mut panel = make_panel();
-    // F_DESKTOP_NOTIFICATIONS is the last field and is always visible
-    panel.selected = F_DESKTOP_NOTIFICATIONS;
+    // F_URL_OPENER is the last field and is always visible
+    panel.selected = F_URL_OPENER;
     panel.handle_down();
-    assert_eq!(panel.selected, F_DESKTOP_NOTIFICATIONS);
+    assert_eq!(panel.selected, F_URL_OPENER);
 }
 
 #[test]
diff --git a/src/input/mouse_ops.rs b/src/input/mouse_ops.rs
index 05ea1fb..df2c3a9 100644
--- a/src/input/mouse_ops.rs
+++ b/src/input/mouse_ops.rs
@@ -6,7 +6,11 @@ use crate::input::InputMode;
 
 use crate::App;
 
-pub(super) fn open_url(url: &str) {
+pub(super) fn open_url(url: &str, opener: &str) {
+    if !opener.is_empty() {
+        let _ = std::process::Command::new(opener).arg(url).spawn();
+        return;
+    }
     #[cfg(target_os = "linux")]
     {
         let _ = std::process::Command::new("xdg-open").arg(url).spawn();
@@ -178,7 +182,8 @@ impl App {
             self.state.tab_mut().mode = InputMode::Insert;
             if start_col == cur_col && start_row == cur_row {
                 if let Some(url) = self.state.hovered_url.clone() {
-                    open_url(&url);
+                    let opener = self.state.config.window.url_opener.clone();
+                    open_url(&url, &opener);
                 }
                 if let Some(w) = &self.window {
                     w.request_redraw();