diff --git a/src/js/scriptlet-filtering.js b/src/js/scriptlet-filtering.js
index 4c01ed3f2340a..4ef2d50f3edd8 100644
--- a/src/js/scriptlet-filtering.js
+++ b/src/js/scriptlet-filtering.js
@@ -369,10 +369,6 @@ scriptletFilteringEngine.retrieve = function(request, options = {}) {
     return out.join('\n');
 };
 
-scriptletFilteringEngine.hasScriptlet = function(hostname, exceptionBit, scriptlet) {
-    return scriptletDB.hasStr(hostname, exceptionBit, scriptlet);
-};
-
 scriptletFilteringEngine.injectNow = function(details) {
     if ( typeof details.frameId !== 'number' ) { return; }
     const request = {
diff --git a/src/js/static-ext-filtering-db.js b/src/js/static-ext-filtering-db.js
index 8669e4e9e43e2..4f3696cfc4185 100644
--- a/src/js/static-ext-filtering-db.js
+++ b/src/js/static-ext-filtering-db.js
@@ -122,34 +122,6 @@ const StaticExtFilteringHostnameDB = class {
         }
     }
 
-    hasStr(hostname, exceptionBit, value) {
-        let found = false;
-        for (;;) {
-            let iHn = this.hostnameToSlotIdMap.get(hostname);
-            if ( iHn !== undefined ) {
-                do {
-                    const strId = this.hostnameSlots[iHn+0];
-                    const str = this.strSlots[strId >>> this.nBits];
-                    if ( (strId & exceptionBit) !== 0 ) {
-                        if ( str === value || str === '' ) { return false; }
-                    }
-                    if ( str === value ) { found = true; }
-                    iHn = this.hostnameSlots[iHn+1];
-                } while ( iHn !== 0 );
-            }
-            if ( hostname === '' ) { break; }
-            const pos = hostname.indexOf('.');
-            if ( pos !== -1 ) {
-                hostname = hostname.slice(pos + 1);
-            } else if ( hostname !== '*' ) {
-                hostname = '*';
-            } else {
-                hostname = '';
-            }
-        }
-        return found;
-    }
-
     toSelfie() {
         return {
             hostnameToSlotIdMap: Array.from(this.hostnameToSlotIdMap),
diff --git a/src/js/traffic.js b/src/js/traffic.js
index a653d036867ab..b1b930edd3df9 100644
--- a/src/js/traffic.js
+++ b/src/js/traffic.js
@@ -61,9 +61,6 @@ window.addEventListener('webextFlavor', function() {
         vAPI.webextFlavor.soup.has('firefox');
 }, { once: true });
 
-// https://github.com/uBlockOrigin/uBlock-issues/issues/1553
-const supportsFloc = document.interestCohort instanceof Function;
-
 /******************************************************************************/
 
 const patchLocalRedirectURL = url => url.charCodeAt(0) === 0x2F /* '/' */
@@ -562,9 +559,6 @@ const onHeadersReceived = function(details) {
     if ( injectCSP(fctxt, pageStore, responseHeaders) === true ) {
         modifiedHeaders = true;
     }
-    if ( supportsFloc && foilFloc(fctxt, responseHeaders) ) {
-        modifiedHeaders = true;
-    }
 
     // https://bugzilla.mozilla.org/show_bug.cgi?id=1376932
     //   Prevent document from being cached by the browser if we modified it,
@@ -1012,23 +1006,6 @@ const injectCSP = function(fctxt, pageStore, responseHeaders) {
 
 /******************************************************************************/
 
-// https://github.com/uBlockOrigin/uBlock-issues/issues/1553
-// https://github.com/WICG/floc#opting-out-of-computation
-
-const foilFloc = function(fctxt, responseHeaders) {
-    const hn = fctxt.getHostname();
-    if ( scriptletFilteringEngine.hasScriptlet(hn, 1, 'no-floc') === false ) {
-        return false;
-    }
-    responseHeaders.push({
-        name: 'Permissions-Policy',
-        value: 'interest-cohort=()' }
-    );
-    return true;
-};
-
-/******************************************************************************/
-
 // https://github.com/gorhill/uBlock/issues/1163
 //   "Block elements by size".
 // https://github.com/gorhill/uBlock/issues/1390#issuecomment-187310719