Working version

popup/history.js

@@ -0,0 +1,28 @@
+let psshs=chrome.extension.getBackgroundPage().psshs;
+function showHistory(){
+    chrome.storage.local.get(null, (data => {
+        let tree=jsonview.renderJSON(JSON.stringify(data), document.getElementById('histDisp'));
+        jsonview.toggleNode(tree);
+    }));
+}
+
+function saveHistory(){
+    chrome.storage.local.get(null, (data => {
+        let blob = new Blob([JSON.stringify(data, null, "\t")], {type: "text/plain"});
+        let a = document.createElement('a');
+        a.download = 'wvgHistory.json';
+        a.href = URL.createObjectURL(blob);
+        a.click();
+    }));
+}
+
+function clearHistory(){
+    if(confirm("Do you really want to clear history?")){
+        chrome.storage.local.clear();
+        document.getElementById('histDisp').innerHTML="";
+    }
+}
+
+document.getElementById('saveHistory').addEventListener("click", saveHistory);
+document.getElementById('clearHistory').addEventListener("click", clearHistory);
+showHistory()