--- a/devtools/client/framework/target.js
+++ b/devtools/client/framework/target.js
@@ -138,16 +138,18 @@ function TabTarget(tab) {
   // Default isTabActor to true if not explicitly specified
   if (typeof tab.isTabActor == "boolean") {
     this._isTabActor = tab.isTabActor;
   } else {
     this._isTabActor = true;
   }
 }
 
+exports.TabTarget = TabTarget;
+
 TabTarget.prototype = {
   _webProgressListener: null,
 
   /**
    * Returns a promise for the protocol description from the root actor. Used
    * internally with `target.actorHasMethod`. Takes advantage of caching if
    * definition was fetched previously with the corresponding actor information.
    * Actors are lazily loaded, so not only must the tool using a specific actor