diff --git a/src/js/hntrie.js b/src/js/hntrie.js
index 366451af3..7da7d7778 100644
--- a/src/js/hntrie.js
+++ b/src/js/hntrie.js
@@ -610,6 +610,20 @@ HNTrieContainer.prototype.HNTrieRef = class {
         return this.last;
     }
 
+    dump() {
+        let hostnames = Array.from(this);
+        if ( String.prototype.padStart instanceof Function ) {
+            const maxlen = Math.min(
+                hostnames.reduce((maxlen, hn) => Math.max(maxlen, hn.length), 0),
+                64
+            );
+            hostnames = hostnames.map(hn => hn.padStart(maxlen));
+        }
+        for ( const hn of hostnames ) {
+            console.log(hn);
+        }
+    }
+
     [Symbol.iterator]() {
         return {
             value: undefined,
diff --git a/src/js/static-net-filtering.js b/src/js/static-net-filtering.js
index c821e7a1e..169e6251c 100644
--- a/src/js/static-net-filtering.js
+++ b/src/js/static-net-filtering.js
@@ -1737,10 +1737,8 @@ const FilterParser = function() {
     this.reBadDomainOptChars = /[*+?^${}()[\]\\]/;
     this.reHostnameRule1 = /^[0-9a-z][0-9a-z.-]*[0-9a-z]$/i;
     this.reHostnameRule2 = /^[0-9a-z][0-9a-z.-]*[0-9a-z]\^?$/i;
-    this.reCleanupHostnameRule2 = /\^$/g;
     this.reCanTrimCarets1 = /^[^*]*$/;
     this.reCanTrimCarets2 = /^\^?[^^]+[^^][^^]+\^?$/;
-    this.reHasUppercase = /[A-Z]/;
     this.reIsolateHostname = /^(\*?\.)?([^\x00-\x24\x26-\x2C\x2F\x3A-\x5E\x60\x7B-\x7F]+)(.*)/;
     this.reHasUnicode = /[^\x00-\x7F]/;
     this.reWebsocketAny = /^ws[s*]?(?::\/?\/?)?\*?$/;
@@ -1990,18 +1988,18 @@ FilterParser.prototype.parse = function(raw) {
     // important!
     this.reset();
 
-    var s = this.raw = raw;
+    let s = this.raw = raw;
 
     // plain hostname? (from HOSTS file)
     if ( this.reHostnameRule1.test(s) ) {
-        this.f = s;
+        this.f = s.toLowerCase();
         this.hostnamePure = true;
         this.anchor |= 0x4;
         return this;
     }
 
     // element hiding filter?
-    var pos = s.indexOf('#');
+    let pos = s.indexOf('#');
     if ( pos !== -1 ) {
         var c = s.charAt(pos + 1);
         if ( c === '#' || c === '@' ) {
@@ -2093,7 +2091,10 @@ FilterParser.prototype.parse = function(raw) {
         // A filter can't be a pure-hostname one if there is a domain or csp
         // option present.
         if ( this.reHostnameRule2.test(s) ) {
-            this.f = s.replace(this.reCleanupHostnameRule2, '');
+            if ( s.charCodeAt(s.length - 1) === 0x5E /* '^' */ ) {
+                s = s.slice(0, -1);
+            }
+            this.f = s.toLowerCase();
             this.hostnamePure = true;
             return this;
         }
@@ -2138,11 +2139,7 @@ FilterParser.prototype.parse = function(raw) {
     }
 
     this.wildcarded = reIsWildcarded.test(s);
-
-    // This might look weird but we gain memory footprint by not going through
-    // toLowerCase(), at least on Chromium. Because copy-on-write?
-
-    this.f = this.reHasUppercase.test(s) ? s.toLowerCase() : s;
+    this.f = s.toLowerCase();
 
     return this;
 };
diff --git a/src/js/strie.js b/src/js/strie.js
index 963671e97..dc8fc6ac0 100644
--- a/src/js/strie.js
+++ b/src/js/strie.js
@@ -385,6 +385,12 @@ STrieContainer.prototype.STrieRef = class {
         return this.container.matches(this.iroot, a, al);
     }
 
+    dump() {
+        for ( const s of this ) {
+            console.log(s);
+        }
+    }
+
     [Symbol.iterator]() {
         return {
             value: undefined,
@@ -408,8 +414,8 @@ STrieContainer.prototype.STrieRef = class {
                     let i0 = this.container.buf32[STRIE_CHAR0_SLOT] + (v & 0x00FFFFFF);
                     const i1 = i0 + (v >>> 24);
                     while ( i0 < i1 ) {
-                        this.charPtr -= 1;
                         this.charBuf[this.charPtr] = this.container.buf[i0];
+                        this.charPtr += 1;
                         i0 += 1;
                     }
                     this.icell = this.container.buf32[this.icell+1];
@@ -424,14 +430,14 @@ STrieContainer.prototype.STrieRef = class {
             },
             toPattern: function() {
                 this.value = this.textDecoder.decode(
-                    new Uint8Array(this.charBuf.buffer, this.charPtr)
+                    new Uint8Array(this.charBuf.buffer, 0, this.charPtr)
                 );
                 return this;
             },
             container: this.container,
             icell: this.iroot,
             charBuf: new Uint8Array(256),
-            charPtr: 256,
+            charPtr: 0,
             forks: [],
             textDecoder: new TextDecoder()
         };