Added import feature.

src/scripts/background.js

@@ -0,0 +1,23 @@
+document.getElementById("inputId").onchange = (e) => {
+    var reader = new FileReader();
+    reader.onloadend = function(obj){
+        let data       = obj.target.result;
+        let enteryName = prompt("What is this session's name?", "" + new Date().toLocaleString()
+                                                                               .split(',')[0]);
+        if (enteryName) {
+            browser.storage.local.set({[enteryName]: data});
+        }
+    };
+
+    if (e.target.files[0].type == "application/json")
+        reader.readAsText(e.target.files[0], {encoding: "string"});
+};
+
+
+document.addEventListener("click", (e) => {
+    if (e.button == 0) {  // Left click
+        if (e.target.className == "container") {
+            document.getElementById("inputId").click();
+        }
+    }
+});

src/scripts/events.js

@@ -17,6 +17,8 @@ document.addEventListener("click", (e) => {
             }
         } else if (e.target.name == "save") {
             saveSession();
+        } else if (e.target.name == "import") {
+            importSession();
         } else if (selectedItem) {
             if (e.target.name == "download")
                 downloadSession();

src/scripts/sessionManager.js

@@ -37,6 +37,13 @@ const saveToStorage = (name, data) => {
     storage.set({[name]: data});
 }
 
+const importSession = () => {
+    browser.tabs.create({
+      url: browser.extension.getURL("../pages/import.html"),
+      active: true
+    });
+}
+
 const downloadSession = () => {
     var dlAnchorElem = document.getElementById('downloadAnchorElem');
     let id           = selectedItem.innerHTML;