diff --git a/components/youtube_script_injector/browser/core/youtube_rule.cc b/components/youtube_script_injector/browser/core/youtube_rule.cc
index f2235c358622..27af6a82a01a 100644
--- a/components/youtube_script_injector/browser/core/youtube_rule.cc
+++ b/components/youtube_script_injector/browser/core/youtube_rule.cc
@@ -22,10 +22,8 @@
 namespace {
 
 // youtube.json keys
-// constexpr char kInclude[] = "include";
-// constexpr char kExclude[] = "exclude";
 constexpr char kVersion[] = "version";
-constexpr char kPolicyScript[] = "policy_script";
+constexpr char kFeatureScript[] = "feature_script";
 
 constexpr char kYouTubeUrl[] = "https://youtube.com";
 
@@ -59,26 +57,20 @@ namespace youtube_script_injector {
 YouTubeRule::YouTubeRule() = default;
 YouTubeRule::~YouTubeRule() = default;
 YouTubeRule::YouTubeRule(const YouTubeRule& other) {
-  // include_pattern_set_ = other.include_pattern_set_.Clone();
-  // exclude_pattern_set_ = other.exclude_pattern_set_.Clone();
-  policy_script_path_ = other.policy_script_path_;
+  feature_script_path_ = other.feature_script_path_;
   version_ = other.version_;
 }
 
 // static
 void YouTubeRule::RegisterJSONConverter(
     base::JSONValueConverter<YouTubeRule>* converter) {
-  // converter->RegisterCustomValueField<extensions::URLPatternSet>(
-  //     kInclude, &YouTubeRule::include_pattern_set_, GetURLPatternSetFromValue);
-  // converter->RegisterCustomValueField<extensions::URLPatternSet>(
-  //     kExclude, &YouTubeRule::exclude_pattern_set_, GetURLPatternSetFromValue);
   converter->RegisterCustomValueField<base::FilePath>(
-      kPolicyScript, &YouTubeRule::policy_script_path_, GetFilePathFromValue);
+      kFeatureScript, &YouTubeRule::feature_script_path_, GetFilePathFromValue);
   converter->RegisterIntField(kVersion, &YouTubeRule::version_);
 }
 
 // static
-std::optional<std::vector<YouTubeRule>> YouTubeRule::ParseRules(
+std::optional<YouTubeRule> YouTubeRule::ParseRules(
     const std::string& contents) {
   if (contents.empty()) {
     return std::nullopt;
@@ -88,17 +80,14 @@ std::optional<std::vector<YouTubeRule>> YouTubeRule::ParseRules(
     VLOG(1) << "YouTubeRule::ParseRules: invalid JSON";
     return std::nullopt;
   }
-  std::vector<YouTubeRule> rules;
+
+  YouTubeRule rule = YouTubeRule();
   base::JSONValueConverter<YouTubeRule> converter;
-  for (base::Value& it : root->GetList()) {
-    YouTubeRule rule = YouTubeRule();
-    if (!converter.Convert(it, &rule)) {
-      VLOG(1) << "YouTubeRule::ParseRules: invalid rule";
-      continue;
-    }
-    rules.emplace_back(rule);
+  if (!converter.Convert(*root, &rule)) {
+    VLOG(1) << "YouTubeRule::ParseRules: invalid rule";
+    return std::nullopt;
   }
-  return rules;
+  return rule;
 }
 
 bool YouTubeRule::IsYouTubeDomain(const GURL& url) const {
@@ -111,19 +100,4 @@ bool YouTubeRule::IsYouTubeDomain(const GURL& url) const {
   return false;
 }
 
-// bool YouTubeRule::ShouldInsertScript(const GURL& url) const {
-//   // If URL matches an explicitly excluded pattern, this rule does not
-//   // apply.
-//   if (exclude_pattern_set_.MatchesURL(url)) {
-//     return false;
-//   }
-//   // If URL does not match an explicitly included pattern, this rule does not
-//   // apply.
-//   if (!include_pattern_set_.MatchesURL(url)) {
-//     return false;
-//   }
-
-//   return true;
-// }
-
 }  // namespace youtube_script_injector
diff --git a/components/youtube_script_injector/browser/core/youtube_rule.h b/components/youtube_script_injector/browser/core/youtube_rule.h
index 55816ad60fa6..c10c630e9a2a 100644
--- a/components/youtube_script_injector/browser/core/youtube_rule.h
+++ b/components/youtube_script_injector/browser/core/youtube_rule.h
@@ -55,21 +55,21 @@ class YouTubeRule {
       base::JSONValueConverter<YouTubeRule>* converter);
 
   // Parse the youtube.json file contents into a vector of YouTubeRule.
-  static std::optional<std::vector<YouTubeRule>> ParseRules(
+  static std::optional<YouTubeRule> ParseRules(
       const std::string& contents);
   // Check if this rule matches the given URL.
   // bool ShouldInsertScript(const GURL& url) const;
   bool IsYouTubeDomain(const GURL& url) const;
 
   // Getters.
-  const base::FilePath& GetPolicyScript() const { return policy_script_path_; }
+  const base::FilePath& GetFeatureScript() const { return feature_script_path_; }
   int GetVersion() const { return version_; }
 
  private:
   // extensions::URLPatternSet include_pattern_set_;
   // extensions::URLPatternSet exclude_pattern_set_;
   // This is a path (not content) relative to the component under scripts/.
-  base::FilePath policy_script_path_;
+  base::FilePath feature_script_path_;
   // Used for checking if the last inserted script is the latest version.
   int version_;
 };
diff --git a/components/youtube_script_injector/browser/core/youtube_rule_registry.cc b/components/youtube_script_injector/browser/core/youtube_rule_registry.cc
index 0d6624a7f79d..ef6d52c5ad76 100644
--- a/components/youtube_script_injector/browser/core/youtube_rule_registry.cc
+++ b/components/youtube_script_injector/browser/core/youtube_rule_registry.cc
@@ -68,17 +68,13 @@ YouTubeRuleRegistry::~YouTubeRuleRegistry() = default;
 void YouTubeRuleRegistry::CheckIfMatch(
     const GURL& url,
     base::OnceCallback<void(MatchedRule)> cb) const {
-  for (const YouTubeRule& rule : rules_) {
-    if (rule.IsYouTubeDomain(url)) {
-      base::ThreadPool::PostTaskAndReplyWithResult(
-          FROM_HERE, {base::MayBlock()},
-          base::BindOnce(&CreateMatchedRule, component_path_,
-                         rule.GetPolicyScript(),
-                         rule.GetVersion()),
-          std::move(cb));
-      // Only ever find one matching rule.
-      return;
-    }
+  if (rule_ && rule_->IsYouTubeDomain(url)) {
+    base::ThreadPool::PostTaskAndReplyWithResult(
+        FROM_HERE, {base::MayBlock()},
+        base::BindOnce(&CreateMatchedRule, component_path_,
+                       rule_->GetFeatureScript(),
+                       rule_->GetVersion()),
+        std::move(cb));
   }
 }
 
@@ -91,16 +87,12 @@ void YouTubeRuleRegistry::LoadRules(const base::FilePath& path) {
                      weak_factory_.GetWeakPtr()));
 }
 
-void YouTubeRuleRegistry::SetComponentPath(const base::FilePath& path) {
-  component_path_ = path;
+void YouTubeRuleRegistry::OnLoadRules(const std::string& contents) {
+  rule_ = YouTubeRule::ParseRules(contents);
 }
 
-void YouTubeRuleRegistry::OnLoadRules(const std::string& contents) {
-  auto parsed_rules = YouTubeRule::ParseRules(contents);
-  if (!parsed_rules) {
-    return;
-  }
-  rules_ = std::move(parsed_rules.value());
+void YouTubeRuleRegistry::SetComponentPath(const base::FilePath& path) {
+  component_path_ = path;
 }
 
 }  // namespace youtube_script_injector
diff --git a/components/youtube_script_injector/browser/core/youtube_rule_registry.h b/components/youtube_script_injector/browser/core/youtube_rule_registry.h
index c2a7a8001d17..f814789cb7f7 100644
--- a/components/youtube_script_injector/browser/core/youtube_rule_registry.h
+++ b/components/youtube_script_injector/browser/core/youtube_rule_registry.h
@@ -50,7 +50,7 @@ class COMPONENT_EXPORT(YOUTUBE_SCRIPT_INJECTOR_BROWSER_CORE) YouTubeRuleRegistry
   void SetComponentPath(const base::FilePath& path);
 
   base::FilePath component_path_;
-  std::vector<YouTubeRule> rules_;
+  std::optional<YouTubeRule> rule_;
 
   base::WeakPtrFactory<YouTubeRuleRegistry> weak_factory_{this};