diff --git a/crates/ui-egui/src/i18n/tests.rs b/crates/ui-egui/src/i18n/tests.rs
index 63c727e15..9fb4b50cf 100644
--- a/crates/ui-egui/src/i18n/tests.rs
+++ b/crates/ui-egui/src/i18n/tests.rs
@@ -954,8 +954,11 @@ fn menu_catalogs_translate_every_menu_label() {
     let language_name = |l: &str| Lang::all().any(|lang| lang.name() == l);
     // Font names and sizes, and installed plug-ins' own names, are not interface text.
     let interface = |(label, id, p): &(&str, &str, serde_json::Value)| {
-        let plugin = *id == "plugin.dialog" || p.get("effect").and_then(serde_json::Value::as_str).is_some_and(|e| e.starts_with("plugin."));
-        *id != "text.setStyle" && !plugin && shown.contains(*label) && !MENU_KEEP_AS_IS.contains(label) && !language_name(label)
+        *id != "text.setStyle"
+            && !crate::menus::lists_plugin(id, p)
+            && shown.contains(*label)
+            && !MENU_KEEP_AS_IS.contains(label)
+            && !language_name(label)
     };
     let mut all: Vec<String> = labels.iter().filter(|l| interface(l)).map(|(l, ..)| l.to_string()).collect();
     all.extend(toggled_labels());
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 3db77498c..92af3c9f6 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -1917,6 +1917,13 @@ fn shows_a_name(id: &str, label: &str) -> bool {
         || (matches!(id, "effect.apply" | "effect.dialog") && vectorcraft_effects::plugin_effects().iter().any(|e| e.label == label))
 }
 
+/// Does the menu item `id` with `params` list an installed plug-in (an Object › Plug-ins filter or
+/// an Effect › Plug-ins effect), by the plug-in's own name? Told by the item itself, so it holds
+/// while another thread installs or removes plug-ins.
+pub(crate) fn lists_plugin(id: &str, params: &Value) -> bool {
+    id == "plugin.dialog" || params.get("effect").and_then(Value::as_str).and_then(vectorcraft_plugins::effect::plugin_id).is_some()
+}
+
 /// The label of a menu item as drawn: [`dynamic_label`] in the UI language. Labels assembled
 /// around a name (Undo *Move*, Reset *Essentials*, Last Effect: *Drop Shadow*) are translated as
 /// templates so the name can move; names that are user data (files, views, fonts, custom
@@ -3952,17 +3959,17 @@ pub const DYNAMIC_LABELS: &[&str] = &[
 
 /// Every English string the menus, the command palette, the panel registry, the toolbar and the
 /// Preferences dialog can show: what a complete language catalog has to cover. Names that are user
-/// data (fonts, recent files, saved views, libraries), the point sizes and the view angles are
-/// left out.
+/// data (fonts, recent files, saved views, libraries, installed plug-ins), the point sizes and the
+/// view angles are left out.
 pub fn menu_strings() -> std::collections::BTreeSet<String> {
     use std::collections::BTreeSet;
-    fn user_data(id: &str) -> bool {
-        hidden_when_disabled(id) || id.starts_with("type.recentFont")
+    fn user_data(id: &str, params: &Value) -> bool {
+        hidden_when_disabled(id) || id.starts_with("type.recentFont") || lists_plugin(id, params)
     }
     fn walk(items: &[Item], under: &str, out: &mut BTreeSet<String>) {
         for it in items {
             match it {
-                Item::Cmd(l, id, _) => {
+                Item::Cmd(l, id, params) => {
                     let size = l.strip_suffix(" pt").is_some_and(|n| n.chars().all(|c| c.is_ascii_digit()));
                     // View › Rotate View lists angles: an optional minus sign, digits and a degree sign.
                     let angle = l
@@ -3971,7 +3978,7 @@ pub fn menu_strings() -> std::collections::BTreeSet<String> {
                         .is_some_and(|n| !n.is_empty() && n.chars().all(|c| c.is_ascii_digit()));
                     // VectorCraft › Language lists each language by its own name.
                     let language_name = *id == "app.language" && crate::i18n::Lang::all().any(|lang| lang.name() == *l);
-                    if !user_data(id) && !size && !angle && !language_name && *l != "—" {
+                    if !user_data(id, params) && !size && !angle && !language_name && *l != "—" {
                         out.insert(l.to_string());
                     }
                 }
diff --git a/crates/ui-egui/src/tests_plugins.rs b/crates/ui-egui/src/tests_plugins.rs
index 7cd254f1d..c934ef672 100644
--- a/crates/ui-egui/src/tests_plugins.rs
+++ b/crates/ui-egui/src/tests_plugins.rs
@@ -58,6 +58,12 @@ fn plugins_are_listed_in_the_object_and_effect_menus() {
     assert_eq!((fx.command.as_deref(), &fx.params), (Some("effect.dialog"), &json!({"effect": "plugin.test.ui.echo"})));
     // Menu clicks on items with params don't turn into the generic parameter dialog.
     assert_eq!(menus::click_target("Desaturate…", "plugin.dialog", &filter.params).0, "plugin.dialog");
+    // Their names are the plug-ins' own, not interface text a language catalog has to cover (they
+    // are installed for the whole test run, while the catalog tests run).
+    let strings = menus::menu_strings();
+    for name in ["Desaturate…", "Test test.ui.echo…"] {
+        assert!(!strings.contains(name), "{name} is a menu string to translate");
+    }
 }
 
 #[test]