diff --git a/platform/chromium/manifest.json b/platform/chromium/manifest.json
index aa83f5f043169..47e9d1e489040 100644
--- a/platform/chromium/manifest.json
+++ b/platform/chromium/manifest.json
@@ -50,7 +50,8 @@
         "https://filterlists.com/*",
         "https://forums.lanik.us/*",
         "https://github.com/*",
-        "https://*.github.io/*"
+        "https://*.github.io/*",
+        "https://*.letsblock.it/*"
       ],
       "js": [
         "/js/scriptlets/subscriber.js"
diff --git a/platform/firefox/manifest.json b/platform/firefox/manifest.json
index 70b4dbd564719..3c214d9750bed 100644
--- a/platform/firefox/manifest.json
+++ b/platform/firefox/manifest.json
@@ -60,7 +60,8 @@
         "https://filterlists.com/*",
         "https://forums.lanik.us/*",
         "https://github.com/*",
-        "https://*.github.io/*"
+        "https://*.github.io/*",
+        "https://*.letsblock.it/*"
       ],
       "js": [
         "/js/scriptlets/subscriber.js"
diff --git a/platform/opera/manifest.json b/platform/opera/manifest.json
index ac669271d5420..5c8b59c4abdfd 100644
--- a/platform/opera/manifest.json
+++ b/platform/opera/manifest.json
@@ -50,7 +50,8 @@
         "https://filterlists.com/*",
         "https://forums.lanik.us/*",
         "https://github.com/*",
-        "https://*.github.io/*"
+        "https://*.github.io/*",
+        "https://*.letsblock.it/*"
       ],
       "js": [
         "/js/scriptlets/subscriber.js"
diff --git a/platform/thunderbird/manifest.json b/platform/thunderbird/manifest.json
index 3f909edbe0915..dd1165c55254e 100644
--- a/platform/thunderbird/manifest.json
+++ b/platform/thunderbird/manifest.json
@@ -41,7 +41,8 @@
         "https://filterlists.com/*",
         "https://forums.lanik.us/*",
         "https://github.com/*",
-        "https://*.github.io/*"
+        "https://*.github.io/*",
+        "https://*.letsblock.it/*"
       ],
       "js": [
         "/js/scriptlets/subscriber.js"