diff --git a/sbt-plugin/src/main/scala/net/lullabyte/JsonCodecs.scala b/sbt-plugin/src/main/scala/net/lullabyte/JsonCodecs.scala
index 4d13eb9..717e7b6 100644
--- a/sbt-plugin/src/main/scala/net/lullabyte/JsonCodecs.scala
+++ b/sbt-plugin/src/main/scala/net/lullabyte/JsonCodecs.scala
@@ -124,6 +124,14 @@ object JsonCodecs {
     )
   }
 
+  implicit val contentScriptEncoder = Encoder.instance[chrome.ContentScript] { contentScript =>
+    Json.obj(
+      ("matches", Json.fromValues(contentScript.matches.map(Json.fromString))),
+      ("css", Json.fromValues(contentScript.css.map(Json.fromString))),
+      ("js", Json.fromValues(contentScript.js.map(Json.fromString)))
+    )
+  }
+
   implicit val actionEncoder = Encoder.instance[chrome.Commands.Action] { action =>
     Json.obj(
       ("suggested_key", action.suggestedKey.asJson),
@@ -189,7 +197,8 @@ object JsonCodecs {
       ("omnibox", manifest.omnibox.asJson),
       ("options_ui", manifest.optionsUI.asJson),
       ("browser_action", manifest.browserAction.asJson),
-      ("chrome_ui_overrides", manifest.chromeUIOverrides.asJson)
+      ("chrome_ui_overrides", manifest.chromeUIOverrides.asJson),
+      ("content_scripts", manifest.contentScripts.asJson)
     )
     Json.fromFields(
       commonValues ++ extValues
diff --git a/shared/src/main/scala/chrome/Manifest.scala b/shared/src/main/scala/chrome/Manifest.scala
index 23525f2..4b94388 100644
--- a/shared/src/main/scala/chrome/Manifest.scala
+++ b/shared/src/main/scala/chrome/Manifest.scala
@@ -35,6 +35,12 @@ case class BrowserAction(
     title: Option[String] = None,
     popup: Option[String] = None
 )
+
+case class ContentScript(
+    matches: List[String],
+    css: List[String],
+    js: List[String])
+
 case class Bluetooth(
     uuids: List[String] = Nil,
     socket: Option[Boolean] = None,
@@ -103,4 +109,5 @@ trait ExtensionManifest extends chrome.Manifest {
   val omnibox: Option[Omnibox] = None
   val optionsUI: Option[OptionsUI] = None
   val chromeUIOverrides: Option[ChromeUIOverrides] = None
+  val contentScripts: List[ContentScript] = List.empty
 }