Catch sanitizer fails only when new CSSStyleSheet() is not available

ext/js/core/utilities.js

@@ -16,6 +16,9 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+import {log} from './log.js';
+
+
 /**
  * Converts any string into a form that can be passed into the RegExp constructor.
  * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
@@ -268,7 +271,15 @@ export function promiseTimeout(delay) {
  * @returns {string}
  */
 export function sanitizeCSS(css) {
-    const sanitizer = new CSSStyleSheet();
+    let sanitizer;
+    // As of 2023/03/xx, all latest browser versions support this but some forks may lag behind
+    try {
+        sanitizer = new CSSStyleSheet();
+    } catch (e) {
+        log.log("Failed to sanitize dictionary styles")
+        log.warn(e);
+        return css;
+    }
     sanitizer.replaceSync(css);
     return Array.from(sanitizer.cssRules).map(rule => rule.cssText || '').join('\n');
 }