Properly detect unsupported pseudo operators

Related feedback:
- https://www.reddit.com/r/uBlockOrigin/comments/yr8eda/

src/js/static-filtering-parser.js

@@ -1549,6 +1549,10 @@ Parser.prototype.SelectorCompiler = class {
 
         // Post-analysis
         // Mind https://w3c.github.io/csswg-drafts/selectors-4/#has-pseudo
+        if ( data.name.startsWith('-abp-') ) {
+            data.type = 'Error';
+            return;
+        }
         data.name = this.normalizedOperators.get(data.name) || data.name;
         if ( this.proceduralOperatorNames.has(data.name) ) {
             data.type = 'ProceduralSelector';