diff --git a/package.json b/package.json
index 5b0d86449..2f3c80fec 100644
--- a/package.json
+++ b/package.json
@@ -111,7 +111,7 @@
     "scratch-render": "0.1.0-prerelease.20190312125229",
     "scratch-storage": "1.2.2",
     "scratch-svg-renderer": "0.2.0-prerelease.20190329052730",
-    "scratch-vm": "0.2.0-prerelease.20190326160300",
+    "scratch-vm": "0.2.0-prerelease.20190329172358",
     "selenium-webdriver": "3.6.0",
     "startaudiocontext": "1.2.1",
     "style-loader": "^0.23.0",
diff --git a/src/containers/blocks.jsx b/src/containers/blocks.jsx
index ecb998ea4..d79c7e9c7 100644
--- a/src/containers/blocks.jsx
+++ b/src/containers/blocks.jsx
@@ -96,6 +96,21 @@ class Blocks extends React.Component {
         );
         this.workspace = this.ScratchBlocks.inject(this.blocks, workspaceConfig);
 
+        // Register buttons under new callback keys for creating variables,
+        // lists, and procedures from extensions.
+
+        const toolboxWorkspace = this.workspace.getFlyout().getWorkspace();
+
+        const varListButtonCallback = type =>
+            (() => this.ScratchBlocks.Variables.createVariable(this.workspace, null, type));
+        const procButtonCallback = () => {
+            this.ScratchBlocks.Procedures.createProcedureDefCallback_(this.workspace);
+        };
+
+        toolboxWorkspace.registerButtonCallback('MAKE_A_VARIABLE', varListButtonCallback(''));
+        toolboxWorkspace.registerButtonCallback('MAKE_A_LIST', varListButtonCallback('list'));
+        toolboxWorkspace.registerButtonCallback('MAKE_A_PROCEDURE', procButtonCallback);
+
         // Store the xml of the toolbox that is actually rendered.
         // This is used in componentDidUpdate instead of prevProps, because
         // the xml can change while e.g. on the costumes tab.
diff --git a/src/containers/sb-file-uploader.jsx b/src/containers/sb-file-uploader.jsx
index de89b3afd..cc2e488b5 100644
--- a/src/containers/sb-file-uploader.jsx
+++ b/src/containers/sb-file-uploader.jsx
@@ -118,12 +118,6 @@ class SBFileUploader extends React.Component {
             const filename = this.fileToUpload && this.fileToUpload.name;
             this.props.vm.loadProject(this.reader.result)
                 .then(() => {
-                    // Remove the hash if any (without triggering a hash change event or a reload)
-                    try { // Can fail e.g. when GUI is loaded from static file (integration tests)
-                        history.replaceState({}, document.title, '.');
-                    } catch {
-                        // No fallback, just do not trigger promise catch below
-                    }
                     this.props.onLoadingFinished(this.props.loadingState, true);
                     // Reset the file input after project is loaded
                     // This is necessary in case the user wants to reload a project