diff --git a/lighthouse-core/audits/byte-efficiency/uses-long-cache-ttl.js b/lighthouse-core/audits/byte-efficiency/uses-long-cache-ttl.js
index 0d4738055aee..79322f4d057e 100644
--- a/lighthouse-core/audits/byte-efficiency/uses-long-cache-ttl.js
+++ b/lighthouse-core/audits/byte-efficiency/uses-long-cache-ttl.js
@@ -152,11 +152,12 @@ class CacheHeaders extends Audit {
       NetworkRequest.TYPES.Stylesheet,
     ]);
 
-    const resourceUrl = record.url;
+    // It's not a request loaded over the network, caching makes no sense
+    if (URL.NON_NETWORK_PROTOCOLS.includes(record.protocol)) return false;
+
     return (
       CACHEABLE_STATUS_CODES.has(record.statusCode) &&
-      STATIC_RESOURCE_TYPES.has(record.resourceType || 'Other') &&
-      !resourceUrl.includes('data:')
+      STATIC_RESOURCE_TYPES.has(record.resourceType || 'Other')
     );
   }
 
diff --git a/lighthouse-core/audits/font-display.js b/lighthouse-core/audits/font-display.js
index f6460c28eed2..32a219b4ab38 100644
--- a/lighthouse-core/audits/font-display.js
+++ b/lighthouse-core/audits/font-display.js
@@ -116,6 +116,7 @@ class FontDisplay extends Audit {
       .filter(record => !passingFontURLs.has(record.url))
       // ...and that aren't data URLs, the blocking concern doesn't really apply
       .filter(record => !/^data:/.test(record.url))
+      .filter(record => !/^blob:/.test(record.url))
       .map(record => {
         // In reality the end time should be calculated with paint time included
         // all browsers wait 3000ms to block text so we make sure 3000 is our max wasted time
diff --git a/lighthouse-core/gather/gatherers/dobetterweb/tags-blocking-first-paint.js b/lighthouse-core/gather/gatherers/dobetterweb/tags-blocking-first-paint.js
index d536ffefb930..876b279450a4 100644
--- a/lighthouse-core/gather/gatherers/dobetterweb/tags-blocking-first-paint.js
+++ b/lighthouse-core/gather/gatherers/dobetterweb/tags-blocking-first-paint.js
@@ -56,6 +56,7 @@ function collectTagsThatBlockFirstPaint() {
               !scriptTag.hasAttribute('async') &&
               !scriptTag.hasAttribute('defer') &&
               !/^data:/.test(scriptTag.src) &&
+              !/^blob:/.test(scriptTag.src) &&
               scriptTag.getAttribute('type') !== 'module'
             );
           } else if (tag.tagName === 'LINK') {
diff --git a/lighthouse-core/test/audits/byte-efficiency/uses-long-cache-ttl-test.js b/lighthouse-core/test/audits/byte-efficiency/uses-long-cache-ttl-test.js
index aba0f68d014c..4a37871833d1 100644
--- a/lighthouse-core/test/audits/byte-efficiency/uses-long-cache-ttl-test.js
+++ b/lighthouse-core/test/audits/byte-efficiency/uses-long-cache-ttl-test.js
@@ -24,6 +24,7 @@ function networkRecord(options = {}) {
     statusCode: options.statusCode || 200,
     resourceType: options.resourceType || NetworkRequest.TYPES.Script,
     transferSize: options.transferSize || 10000,
+    protocol: options.protocol || 'http/1.1',
     responseHeaders: headers,
   };
 }
@@ -207,7 +208,8 @@ describe('Cache headers audit', () => {
     const networkRecords = [
       networkRecord({statusCode: 500}),
       networkRecord({url: 'https://example.com/dynamic.js?userId=crazy', transferSize: 10}),
-      networkRecord({url: 'data:image/jpeg;base64,what'}),
+      networkRecord({url: 'data:image/jpeg;base64,what', protocol: 'data'}),
+      networkRecord({url: 'blob:http://example.com/ca6df701-9c67-49fd-a787', protocol: 'blob'}),
       networkRecord({resourceType: NetworkRequest.TYPES.XHR}),
     ];
 
diff --git a/lighthouse-core/test/results/sample_v2.json b/lighthouse-core/test/results/sample_v2.json
index 0d28987cbb71..215e7f865bf0 100644
--- a/lighthouse-core/test/results/sample_v2.json
+++ b/lighthouse-core/test/results/sample_v2.json
@@ -1910,7 +1910,7 @@
       "score": 0.58,
       "scoreDisplayMode": "numeric",
       "numericValue": 103455,
-      "displayValue": "11 resources found",
+      "displayValue": "10 resources found",
       "details": {
         "type": "table",
         "headings": [
@@ -2003,13 +2003,6 @@
             "cacheHitProbability": 0,
             "totalBytes": 144,
             "wastedBytes": 144
-          },
-          {
-            "url": "blob:http://localhost:10200/ae0eac03-ab9b-4a6a-b299-f5212153e277",
-            "cacheLifetimeMs": 0,
-            "cacheHitProbability": 0,
-            "totalBytes": 0,
-            "wastedBytes": 0
           }
         ],
         "summary": {
@@ -5092,7 +5085,7 @@
       "lighthouse-core/audits/byte-efficiency/uses-long-cache-ttl.js | displayValue": [
         {
           "values": {
-            "itemCount": 11
+            "itemCount": 10
           },
           "path": "audits[uses-long-cache-ttl].displayValue"
         }
diff --git a/proto/sample_v2_round_trip.json b/proto/sample_v2_round_trip.json
index 84813c3df6a2..384202256685 100644
--- a/proto/sample_v2_round_trip.json
+++ b/proto/sample_v2_round_trip.json
@@ -2659,13 +2659,6 @@
                         "totalBytes": 144.0, 
                         "url": "http://localhost:10200/dobetterweb/empty_module.js?delay=500", 
                         "wastedBytes": 144.0
-                    }, 
-                    {
-                        "cacheHitProbability": 0.0, 
-                        "cacheLifetimeMs": 0.0, 
-                        "totalBytes": 0.0, 
-                        "url": "blob:http://localhost:10200/ae0eac03-ab9b-4a6a-b299-f5212153e277", 
-                        "wastedBytes": 0.0
                     }
                 ], 
                 "summary": {
@@ -2673,7 +2666,7 @@
                 }, 
                 "type": "table"
             }, 
-            "displayValue": "11 resources found", 
+            "displayValue": "10 resources found", 
             "id": "uses-long-cache-ttl", 
             "numericValue": 103455.0, 
             "score": 0.58,