diff --git a/background/common.js b/background/common.js
index b75db5d5..9eb6ba1e 100644
--- a/background/common.js
+++ b/background/common.js
@@ -11,7 +11,7 @@ bgReady.all = new Promise(r => (bgReady._resolveAll = r));
 
 const uuidIndex = Object.assign(new Map(), {
   custom: {},
-  customize(obj, setter) {
+  addCustomId(obj, setter) {
     Object.defineProperty(uuidIndex.custom, obj.id, {
       get: () => obj,
       set: setter,
diff --git a/background/style-manager.js b/background/style-manager.js
index b480911c..ac6702bb 100644
--- a/background/style-manager.js
+++ b/background/style-manager.js
@@ -73,7 +73,7 @@ const styleMan = (() => {
     _id: `${chrome.runtime.id}-${INJ_ORDER}`,
     _rev: 0,
   };
-  uuidIndex.customize(orderWrap, setOrder);
+  uuidIndex.addCustomId(orderWrap, setOrder);
   /** @type {Promise|boolean} will be `true` to avoid wasting a microtask tick on each `await` */
   let ready = init();