limit to Chrome

background/style-manager.js

@@ -184,7 +184,8 @@ const styleMan = (() => {
           },
         };
       }
-      const {exposeStyleName} = prefs.__values;
+      // TODO: enable in FF when it supports sourceURL comment in style elements (also options.html)
+      const {exposeStyleName} = CHROME && prefs.__values;
       const sender = CHROME && this && this.sender || {};
       if (sender.frameId === 0) {
         /* Chrome hides text frament from location.href of the page e.g. #:~:text=foo

options.html

@@ -269,7 +269,7 @@
               <span></span>
             </span>
           </label>
-          <label>
+          <label class="chromium-only">
             <span i18n-text="optionsAdvancedExposeStyleName">
               <a i18n-title="optionsAdvancedExposeStyleNameNote"
                  data-cmd="note" class="svg-inline-wrapper" tabindex="0">

options/options.css

@@ -105,6 +105,11 @@ a:hover .svg-icon,
 .chromium-only.chrome-no-popup-border {
   display: none;
 }
+label.chromium-only > :first-child::after {
+  content: '(Chrome)';
+  color: #888;
+  margin-left: .5ex;
+}
 
 .block {
   display: flex;
@@ -228,7 +233,7 @@ input[type="color"] {
   position: relative;
 }
 [data-cmd="note"] {
-  padding: .5em 1em .5em 0;
+  padding: .5em 0 .5em 0;
   cursor: pointer;
 }
 .update-in-progress [data-cmd="check-updates"] {