diff --git a/src/js/contentscript.js b/src/js/contentscript.js
index 523997e19..f152625bd 100644
--- a/src/js/contentscript.js
+++ b/src/js/contentscript.js
@@ -803,6 +803,11 @@ var domCollapser = (function() {
                 return;
             }
         }
+        // Some data: URI can be quite large: no point in taking into account
+        // the whole URI.
+        if ( src.lastIndexOf('data:', 0) === 0 ) {
+            src = src.slice(0, 255);
+        }
         var req = new PendingRequest(target, tagName, prop);
         newRequests.push(new BouncingRequest(req.id, tagName, src));
     };
diff --git a/src/js/messaging.js b/src/js/messaging.js
index 2b9096f1f..36e5cd1ac 100644
--- a/src/js/messaging.js
+++ b/src/js/messaging.js
@@ -471,7 +471,10 @@ var tagNameToRequestTypeMap = {
 
 /******************************************************************************/
 
-// Evaluate many requests
+// Evaluate many requests.
+
+// https://github.com/gorhill/uBlock/issues/1782
+//   Treat `data:` URIs as 1st-party resources.
 
 var filterRequests = function(pageStore, details) {
     var requests = details.requests;
@@ -492,9 +495,14 @@ var filterRequests = function(pageStore, details) {
     var i = requests.length;
     while ( i-- ) {
         request = requests[i];
-        context.requestURL = punycodeURL(request.url);
+        if ( request.url.startsWith('data:') ) {
+            context.requestURL = request.url;
+            context.requestHostname = context.pageHostname;
+        } else {
+            context.requestURL = punycodeURL(request.url);
+            context.requestHostname = hostnameFromURI(context.requestURL);
+        }
         context.requestType = tagNameToRequestTypeMap[request.tagName];
-        context.requestHostname = hostnameFromURI(request.url);
         r = pageStore.filterRequest(context);
         if ( typeof r !== 'string' || r.charAt(1) !== 'b' ) {
             continue;
diff --git a/src/js/static-net-filtering.js b/src/js/static-net-filtering.js
index 3681754c2..bb4b1dba9 100644
--- a/src/js/static-net-filtering.js
+++ b/src/js/static-net-filtering.js
@@ -172,8 +172,8 @@ var atoi = function(s) {
     return cachedParseInt(s, 10);
 };
 
+// Be sure to not confuse 'example.com' with 'anotherexample.com'
 var isFirstParty = function(domain, hostname) {
-    // Be sure to not confuse 'example.com' with 'anotherexample.com'
     return hostname.endsWith(domain) &&
           (hostname.length === domain.length ||
            hostname.charAt(hostname.length - domain.length - 1) === '.');