diff --git a/CHANGELOG.md b/CHANGELOG.md
index a3ef306..0d73f22 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 CHANGELOG
 =============================
+* 5.1.0
+  * Added browser polyfill in preparation for Firefox compatibility
 * 5.0.2
   * Added light/dark mode style to settings
   * Slight style improvements for settings
diff --git a/html/menu_ui.html b/html/menu_ui.html
index b91cda1..1edde86 100644
--- a/html/menu_ui.html
+++ b/html/menu_ui.html
@@ -161,5 +161,6 @@ <h1>Credits</h1>
 	</div>
 </div>
 
-<script type="text/javascript" src="../js/menu_ui.js"></script>
+<script type="text/javascript" src="/js/browser-polyfill.min.js"></script>
+<script type="text/javascript" src="/js/menu_ui.js"></script>
 </body>
\ No newline at end of file
diff --git a/js/D3.js b/js/D3.js
index 5acf66e..a90df44 100644
--- a/js/D3.js
+++ b/js/D3.js
@@ -6,7 +6,7 @@ async function getCurrentTab() {
 		active: true,
 		currentWindow: true
 	};
-	let [tab] = await chrome.tabs.query(queryOptions);
+	let [tab] = await browser.tabs.query(queryOptions);
 	return tab;
 }
 
@@ -22,7 +22,7 @@ var D3 = {
 	 * 
 	 * @var String
 	 */
-	version: "5.0.0",
+	version: "5.1.0",
 
 	/**
 	 * Tabs that already had the content worker script injected
@@ -65,7 +65,7 @@ var D3 = {
 	lastMessage: '',
 
 	checkInstall: function (callback) {
-		chrome.storage.sync.get(null, function (items) {
+		browser.storage.sync.get(null).then((items) => {
 			console.log("Check Install: Start");
 			update = {};
 			if (!items["messageType"]) {
@@ -89,7 +89,7 @@ var D3 = {
 				update["version"] = D3.version;
 			}
 
-			chrome.storage.sync.set(update, function () {
+			browser.storage.sync.set(update).then(() => {
 				console.log("Installed decoder version " + D3.version);
 			});
 		});
@@ -104,13 +104,13 @@ var D3 = {
 
 		// Inject the content scripts once at the start
 		if (!(tabId in D3.injected_tabs)) {
-			await chrome.scripting.insertCSS({
+			await browser.scripting.insertCSS({
 				target: {
 					tabId: tabId
 				},
 				files: ["styles/content.css"]
 			});
-			await chrome.scripting.executeScript({
+			await browser.scripting.executeScript({
 				target: {
 					tabId: tabId
 				},
@@ -125,7 +125,7 @@ var D3 = {
 					console.log(['d3coder:: FUNCTION:' + title, text]);
 				};
 
-				chrome.scripting.executeScript({
+				browser.scripting.executeScript({
 					target: {
 						tabId: tabId
 					},
@@ -139,7 +139,7 @@ var D3 = {
 					alert(title + '\n\n' + text);
 				};
 
-				chrome.scripting.executeScript({
+				browser.scripting.executeScript({
 					target: {
 						tabId: tabId
 					},
@@ -153,7 +153,7 @@ var D3 = {
 					D3content.createDiv(title, text);
 				};
 
-				chrome.scripting.executeScript({
+				browser.scripting.executeScript({
 					target: {
 						tabId: tabId
 					},
@@ -168,7 +168,7 @@ var D3 = {
 					D3content.replaceText(text);
 				};
 
-				chrome.scripting.executeScript({
+				browser.scripting.executeScript({
 					target: {
 						tabId: tabId
 					},
@@ -193,7 +193,7 @@ var D3 = {
 		}
 
 		getCurrentTab().then(function (tab) {
-			chrome.scripting.executeScript({
+			browser.scripting.executeScript({
 				target: {
 					tabId: tab.id
 				},
@@ -232,14 +232,12 @@ var D3 = {
 		};
 
 		function clearMenu() {
-			console.log(D3.menuIds);
 			for (id in D3.menuIds) {
 				if (id && D3.menuIds[id] != null) {
-					chrome.contextMenus.remove(D3.menuIds[id]);
+					browser.contextMenus.remove(D3.menuIds[id]);
 				}
 				D3.menuIds[id] = null;
 			}
-			console.log(D3.menuIds);
 		}
 
 		function createMenu(items, name) {
@@ -253,20 +251,19 @@ var D3 = {
 					"id": "d3coder-selection-" + function_list[name][1]
 				};
 				try {
-					D3.menuIds[name] = chrome.contextMenus.create(menu);
+					D3.menuIds[name] = browser.contextMenus.create(menu);
 				} catch (e) {
-					console.log(e);
+					console.log(["Error creating menu", e]);
 				}
 			} else if (items.checkboxes[name] == false) {
 				if (D3.menuIds[name]) {
-					// console.log("Menu: Removing " + D3.menuIds[name]);
-					chrome.contextMenus.remove(D3.menuIds[name]);
+					browser.contextMenus.remove(D3.menuIds[name]);
 					D3.menuIds[name] = null;
 				}
 			}
 		}
 
-		chrome.storage.sync.get(null, function (items) {
+		browser.storage.sync.get(null).then((items) => {
 			clearMenu();
 
 			for (itemName in items.checkboxes) {
@@ -282,7 +279,7 @@ var D3 = {
 				}
 
 				try {
-					D3.menuIds["options"] = chrome.contextMenus.create(menu);
+					D3.menuIds["options"] = browser.contextMenus.create(menu);
 				} catch (e) {
 					console.log(e);
 				}
@@ -293,6 +290,6 @@ var D3 = {
 	translate: function (name) {
 		let e_msg = "Could not translate " + name;
 
-		return chrome.i18n.getMessage(name) || e_msg;
+		return browser.i18n.getMessage(name) || e_msg;
 	}
 };
\ No newline at end of file
diff --git a/js/browser-polyfill.min.js b/js/browser-polyfill.min.js
new file mode 100644
index 0000000..5bd0343
--- /dev/null
+++ b/js/browser-polyfill.min.js
@@ -0,0 +1,8 @@
+(function(a,b){if("function"==typeof define&&define.amd)define("webextension-polyfill",["module"],b);else if("undefined"!=typeof exports)b(module);else{var c={exports:{}};b(c),a.browser=c.exports}})("undefined"==typeof globalThis?"undefined"==typeof self?this:self:globalThis,function(a){"use strict";if(!globalThis.chrome?.runtime?.id)throw new Error("This script should only be loaded in a browser extension.");if("undefined"==typeof globalThis.browser||Object.getPrototypeOf(globalThis.browser)!==Object.prototype){a.exports=(a=>{const b={alarms:{clear:{minArgs:0,maxArgs:1},clearAll:{minArgs:0,maxArgs:0},get:{minArgs:0,maxArgs:1},getAll:{minArgs:0,maxArgs:0}},bookmarks:{create:{minArgs:1,maxArgs:1},get:{minArgs:1,maxArgs:1},getChildren:{minArgs:1,maxArgs:1},getRecent:{minArgs:1,maxArgs:1},getSubTree:{minArgs:1,maxArgs:1},getTree:{minArgs:0,maxArgs:0},move:{minArgs:2,maxArgs:2},remove:{minArgs:1,maxArgs:1},removeTree:{minArgs:1,maxArgs:1},search:{minArgs:1,maxArgs:1},update:{minArgs:2,maxArgs:2}},browserAction:{disable:{minArgs:0,maxArgs:1,fallbackToNoCallback:!0},enable:{minArgs:0,maxArgs:1,fallbackToNoCallback:!0},getBadgeBackgroundColor:{minArgs:1,maxArgs:1},getBadgeText:{minArgs:1,maxArgs:1},getPopup:{minArgs:1,maxArgs:1},getTitle:{minArgs:1,maxArgs:1},openPopup:{minArgs:0,maxArgs:0},setBadgeBackgroundColor:{minArgs:1,maxArgs:1,fallbackToNoCallback:!0},setBadgeText:{minArgs:1,maxArgs:1,fallbackToNoCallback:!0},setIcon:{minArgs:1,maxArgs:1},setPopup:{minArgs:1,maxArgs:1,fallbackToNoCallback:!0},setTitle:{minArgs:1,maxArgs:1,fallbackToNoCallback:!0}},browsingData:{remove:{minArgs:2,maxArgs:2},removeCache:{minArgs:1,maxArgs:1},removeCookies:{minArgs:1,maxArgs:1},removeDownloads:{minArgs:1,maxArgs:1},removeFormData:{minArgs:1,maxArgs:1},removeHistory:{minArgs:1,maxArgs:1},removeLocalStorage:{minArgs:1,maxArgs:1},removePasswords:{minArgs:1,maxArgs:1},removePluginData:{minArgs:1,maxArgs:1},settings:{minArgs:0,maxArgs:0}},commands:{getAll:{minArgs:0,maxArgs:0}},contextMenus:{remove:{minArgs:1,maxArgs:1},removeAll:{minArgs:0,maxArgs:0},update:{minArgs:2,maxArgs:2}},cookies:{get:{minArgs:1,maxArgs:1},getAll:{minArgs:1,maxArgs:1},getAllCookieStores:{minArgs:0,maxArgs:0},remove:{minArgs:1,maxArgs:1},set:{minArgs:1,maxArgs:1}},devtools:{inspectedWindow:{eval:{minArgs:1,maxArgs:2,singleCallbackArg:!1}},panels:{create:{minArgs:3,maxArgs:3,singleCallbackArg:!0},elements:{createSidebarPane:{minArgs:1,maxArgs:1}}}},downloads:{cancel:{minArgs:1,maxArgs:1},download:{minArgs:1,maxArgs:1},erase:{minArgs:1,maxArgs:1},getFileIcon:{minArgs:1,maxArgs:2},open:{minArgs:1,maxArgs:1,fallbackToNoCallback:!0},pause:{minArgs:1,maxArgs:1},removeFile:{minArgs:1,maxArgs:1},resume:{minArgs:1,maxArgs:1},search:{minArgs:1,maxArgs:1},show:{minArgs:1,maxArgs:1,fallbackToNoCallback:!0}},extension:{isAllowedFileSchemeAccess:{minArgs:0,maxArgs:0},isAllowedIncognitoAccess:{minArgs:0,maxArgs:0}},history:{addUrl:{minArgs:1,maxArgs:1},deleteAll:{minArgs:0,maxArgs:0},deleteRange:{minArgs:1,maxArgs:1},deleteUrl:{minArgs:1,maxArgs:1},getVisits:{minArgs:1,maxArgs:1},search:{minArgs:1,maxArgs:1}},i18n:{detectLanguage:{minArgs:1,maxArgs:1},getAcceptLanguages:{minArgs:0,maxArgs:0}},identity:{launchWebAuthFlow:{minArgs:1,maxArgs:1}},idle:{queryState:{minArgs:1,maxArgs:1}},management:{get:{minArgs:1,maxArgs:1},getAll:{minArgs:0,maxArgs:0},getSelf:{minArgs:0,maxArgs:0},setEnabled:{minArgs:2,maxArgs:2},uninstallSelf:{minArgs:0,maxArgs:1}},notifications:{clear:{minArgs:1,maxArgs:1},create:{minArgs:1,maxArgs:2},getAll:{minArgs:0,maxArgs:0},getPermissionLevel:{minArgs:0,maxArgs:0},update:{minArgs:2,maxArgs:2}},pageAction:{getPopup:{minArgs:1,maxArgs:1},getTitle:{minArgs:1,maxArgs:1},hide:{minArgs:1,maxArgs:1,fallbackToNoCallback:!0},setIcon:{minArgs:1,maxArgs:1},setPopup:{minArgs:1,maxArgs:1,fallbackToNoCallback:!0},setTitle:{minArgs:1,maxArgs:1,fallbackToNoCallback:!0},show:{minArgs:1,maxArgs:1,fallbackToNoCallback:!0}},permissions:{contains:{minArgs:1,maxArgs:1},getAll:{minArgs:0,maxArgs:0},remove:{minArgs:1,maxArgs:1},request:{minArgs:1,maxArgs:1}},runtime:{getBackgroundPage:{minArgs:0,maxArgs:0},getPlatformInfo:{minArgs:0,maxArgs:0},openOptionsPage:{minArgs:0,maxArgs:0},requestUpdateCheck:{minArgs:0,maxArgs:0},sendMessage:{minArgs:1,maxArgs:3},sendNativeMessage:{minArgs:2,maxArgs:2},setUninstallURL:{minArgs:1,maxArgs:1}},sessions:{getDevices:{minArgs:0,maxArgs:1},getRecentlyClosed:{minArgs:0,maxArgs:1},restore:{minArgs:0,maxArgs:1}},storage:{local:{clear:{minArgs:0,maxArgs:0},get:{minArgs:0,maxArgs:1},getBytesInUse:{minArgs:0,maxArgs:1},remove:{minArgs:1,maxArgs:1},set:{minArgs:1,maxArgs:1}},managed:{get:{minArgs:0,maxArgs:1},getBytesInUse:{minArgs:0,maxArgs:1}},sync:{clear:{minArgs:0,maxArgs:0},get:{minArgs:0,maxArgs:1},getBytesInUse:{minArgs:0,maxArgs:1},remove:{minArgs:1,maxArgs:1},set:{minArgs:1,maxArgs:1}}},tabs:{captureVisibleTab:{minArgs:0,maxArgs:2},create:{minArgs:1,maxArgs:1},detectLanguage:{minArgs:0,maxArgs:1},discard:{minArgs:0,maxArgs:1},duplicate:{minArgs:1,maxArgs:1},executeScript:{minArgs:1,maxArgs:2},get:{minArgs:1,maxArgs:1},getCurrent:{minArgs:0,maxArgs:0},getZoom:{minArgs:0,maxArgs:1},getZoomSettings:{minArgs:0,maxArgs:1},goBack:{minArgs:0,maxArgs:1},goForward:{minArgs:0,maxArgs:1},highlight:{minArgs:1,maxArgs:1},insertCSS:{minArgs:1,maxArgs:2},move:{minArgs:2,maxArgs:2},query:{minArgs:1,maxArgs:1},reload:{minArgs:0,maxArgs:2},remove:{minArgs:1,maxArgs:1},removeCSS:{minArgs:1,maxArgs:2},sendMessage:{minArgs:2,maxArgs:3},setZoom:{minArgs:1,maxArgs:2},setZoomSettings:{minArgs:1,maxArgs:2},update:{minArgs:1,maxArgs:2}},topSites:{get:{minArgs:0,maxArgs:0}},webNavigation:{getAllFrames:{minArgs:1,maxArgs:1},getFrame:{minArgs:1,maxArgs:1}},webRequest:{handlerBehaviorChanged:{minArgs:0,maxArgs:0}},windows:{create:{minArgs:0,maxArgs:1},get:{minArgs:1,maxArgs:2},getAll:{minArgs:0,maxArgs:1},getCurrent:{minArgs:0,maxArgs:1},getLastFocused:{minArgs:0,maxArgs:1},remove:{minArgs:1,maxArgs:1},update:{minArgs:2,maxArgs:2}}};if(0===Object.keys(b).length)throw new Error("api-metadata.json has not been included in browser-polyfill");class c extends WeakMap{constructor(a,b=void 0){super(b),this.createItem=a}get(a){return this.has(a)||this.set(a,this.createItem(a)),super.get(a)}}const d=a=>a&&"object"==typeof a&&"function"==typeof a.then,e=(b,c)=>(...d)=>{a.runtime.lastError?b.reject(new Error(a.runtime.lastError.message)):c.singleCallbackArg||1>=d.length&&!1!==c.singleCallbackArg?b.resolve(d[0]):b.resolve(d)},f=a=>1==a?"argument":"arguments",g=(a,b)=>function(c,...d){if(d.length<b.minArgs)throw new Error(`Expected at least ${b.minArgs} ${f(b.minArgs)} for ${a}(), got ${d.length}`);if(d.length>b.maxArgs)throw new Error(`Expected at most ${b.maxArgs} ${f(b.maxArgs)} for ${a}(), got ${d.length}`);return new Promise((f,g)=>{if(b.fallbackToNoCallback)try{c[a](...d,e({resolve:f,reject:g},b))}catch(e){console.warn(`${a} API method doesn't seem to support the callback parameter, `+"falling back to call it without a callback: ",e),c[a](...d),b.fallbackToNoCallback=!1,b.noCallback=!0,f()}else b.noCallback?(c[a](...d),f()):c[a](...d,e({resolve:f,reject:g},b))})},h=(a,b,c)=>new Proxy(b,{apply(b,d,e){return c.call(d,a,...e)}});let i=Function.call.bind(Object.prototype.hasOwnProperty);const j=(a,b={},c={})=>{let d=Object.create(null),e=Object.create(a);return new Proxy(e,{has(b,c){return c in a||c in d},get(e,f){if(f in d)return d[f];if(!(f in a))return;let k=a[f];if("function"==typeof k){if("function"==typeof b[f])k=h(a,a[f],b[f]);else if(i(c,f)){let b=g(f,c[f]);k=h(a,a[f],b)}else k=k.bind(a);}else if("object"==typeof k&&null!==k&&(i(b,f)||i(c,f)))k=j(k,b[f],c[f]);else if(i(c,"*"))k=j(k,b[f],c["*"]);else return Object.defineProperty(d,f,{configurable:!0,enumerable:!0,get(){return a[f]},set(b){a[f]=b}}),k;return d[f]=k,k},set(b,c,e){return c in d?d[c]=e:a[c]=e,!0},defineProperty(a,b,c){return Reflect.defineProperty(d,b,c)},deleteProperty(a,b){return Reflect.deleteProperty(d,b)}})},k=a=>({addListener(b,c,...d){b.addListener(a.get(c),...d)},hasListener(b,c){return b.hasListener(a.get(c))},removeListener(b,c){b.removeListener(a.get(c))}}),l=new c(a=>"function"==typeof a?function(b){const c=j(b,{},{getContent:{minArgs:0,maxArgs:0}});a(c)}:a),m=new c(a=>"function"==typeof a?function(b,c,e){let f,g,h=!1,i=new Promise(a=>{f=function(b){h=!0,a(b)}});try{g=a(b,c,f)}catch(a){g=Promise.reject(a)}const j=!0!==g&&d(g);if(!0!==g&&!j&&!h)return!1;const k=a=>{a.then(a=>{e(a)},a=>{let b;b=a&&(a instanceof Error||"string"==typeof a.message)?a.message:"An unexpected error occurred",e({__mozWebExtensionPolyfillReject__:!0,message:b})}).catch(a=>{console.error("Failed to send onMessage rejected reply",a)})};return j?k(g):k(i),!0}:a),n=({reject:b,resolve:c},d)=>{a.runtime.lastError?a.runtime.lastError.message==="The message port closed before a response was received."?c():b(new Error(a.runtime.lastError.message)):d&&d.__mozWebExtensionPolyfillReject__?b(new Error(d.message)):c(d)},o=(a,b,c,...d)=>{if(d.length<b.minArgs)throw new Error(`Expected at least ${b.minArgs} ${f(b.minArgs)} for ${a}(), got ${d.length}`);if(d.length>b.maxArgs)throw new Error(`Expected at most ${b.maxArgs} ${f(b.maxArgs)} for ${a}(), got ${d.length}`);return new Promise((a,b)=>{const e=n.bind(null,{resolve:a,reject:b});d.push(e),c.sendMessage(...d)})},p={devtools:{network:{onRequestFinished:k(l)}},runtime:{onMessage:k(m),onMessageExternal:k(m),sendMessage:o.bind(null,"sendMessage",{minArgs:1,maxArgs:3})},tabs:{sendMessage:o.bind(null,"sendMessage",{minArgs:2,maxArgs:3})}},q={clear:{minArgs:1,maxArgs:1},get:{minArgs:1,maxArgs:1},set:{minArgs:1,maxArgs:1}};return b.privacy={network:{"*":q},services:{"*":q},websites:{"*":q}},j(a,p,b)})(chrome)}else a.exports=globalThis.browser});
+//# sourceMappingURL=browser-polyfill.min.js.map
+
+// webextension-polyfill v.0.10.0 (https://github.com/mozilla/webextension-polyfill)
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
\ No newline at end of file
diff --git a/js/menu_ui.js b/js/menu_ui.js
index 84d78a5..a540ea6 100644
--- a/js/menu_ui.js
+++ b/js/menu_ui.js
@@ -9,7 +9,7 @@ let localizeHtmlPage = function(){
 
     let valStrH = obj.innerHTML.toString();
     let valNewH = valStrH.replace(/__MSG_(\w+)__/g, function(match, v1) {
-      return v1 ? chrome.i18n.getMessage(v1) : "";
+      return v1 ? browser.i18n.getMessage(v1) : "";
     });
 
     if(valNewH != valStrH)
@@ -25,7 +25,7 @@ var D3menu = {
     * 
     * @var String
     */
-  version: "4.0.0",
+  version: "5.1.0",
   
   /**
     * list all functions. Needed to upgrade from older versions
@@ -60,7 +60,7 @@ var D3menu = {
 function upgrade() {
     var clipboardSave, checkboxes = {}, version = D3menu.version;
 
-    chrome.storage.sync.get({version: false}, function(items) {
+    browser.storage.sync.get({version: false}).then((items) => {
         if (items.version) {
             console.log("Upgrade: D3coder version " + version + " found.");
             return;
@@ -79,16 +79,16 @@ function save_options() {
       checkboxes[option.id] = document.getElementById(option.id).checked == true ? true : false;
     }
   
-    chrome.storage.sync.set(
+    browser.storage.sync.set(
       {
         checkboxes: checkboxes,
         messageType: messageType,
         clipboardSave: clipboardSave,
         version: D3menu.version
-      }, function() {
+      }).then(() => {
         console.log("Save: Options saved to storage");
         var status = document.getElementById('status');
-        status.textContent = chrome.i18n.getMessage('options_saved');
+        status.textContent = browser.i18n.getMessage('options_saved');
         status.style.display = "block";
         status.style.opacity = 1;
         setTimeout(function() {
@@ -99,15 +99,15 @@ function save_options() {
   }
 
 // Restores select box and checkbox state using the preferences
-// stored in chrome.storage.
+// stored in browser.storage / chrome.storage.
 function restore_options() {
   console.log("Restore: Starting restore");
-  chrome.storage.sync.get({
+  browser.storage.sync.get({
     checkboxes: [],
     messageType: 'message',
     clipboardSave: false,
     version: 0
-  }, function(items) {
+  }).then((items) => {
     console.log("Restore: Loaded these items:");
     console.log("Restore: Checkboxes", items.checkboxes);
     console.log("Restore: Message Type", items.messageType);
diff --git a/js/serviceworker.js b/js/serviceworker.js
index f15f386..80b2f2e 100644
--- a/js/serviceworker.js
+++ b/js/serviceworker.js
@@ -4,29 +4,32 @@ console.log("Successfully loaded D3 lib");
 importScripts("/js/D3.js");
 console.log("Successfully loaded D3 main");
 
-chrome.runtime.onInstalled.addListener(() => {
+importScripts("/js/browser-polyfill.min.js");
+console.log("Successfully loaded browser-polyfill");
+
+browser.runtime.onInstalled.addListener(() => {
     D3.checkInstall(D3.createContextMenu());
 });
 
-chrome.storage.onChanged.addListener((changes, namespace) => {
+browser.storage.onChanged.addListener((changes, namespace) => {
     D3.createContextMenu();
 });
 
-chrome.runtime.onMessage.addListener(
+browser.runtime.onMessage.addListener(
     (request, sender, sendResponse) => {
         console.log([request, sender, sendResponse]);
 
         if (request.command == "doCopy") {
             var responseStatus = D3.copyToClipboard(D3.lastMessage);
-            sendResponse({status: [chrome.i18n.getMessage("message_copied_to_clipboard"), responseStatus] });
+            sendResponse({status: [browser.i18n.getMessage("message_copied_to_clipboard"), responseStatus] });
         } else if (request.command == "setContextMenuTitle") {
-            chrome.contextMenus.update(contextMenuId, {title: request.message});
+            browser.contextMenus.update(contextMenuId, {title: request.message});
         } else {
             sendResponse({});
         }
 });
 
-chrome.contextMenus.onClicked.addListener(
+browser.contextMenus.onClicked.addListener(
     (info, tab) => {
         menuId = info.menuItemId;
 
@@ -37,10 +40,10 @@ chrome.contextMenus.onClicked.addListener(
 
         // Menu item for the extension's settings page
         if (menuId === 'd3coder-settings') {
-            chrome.runtime.openOptionsPage();
+            browser.runtime.openOptionsPage();
         // Menu for selected/editable text
         } else if (fn_selection === true && fn_normalized in D3lib) {
-            chrome.storage.sync.get(null, (items) => {
+            browser.storage.sync.get(null).then((items) => {
                 D3.createPopup(
                     D3.translate(`function_${fn_normalized}`),
                     D3lib[fn_normalized](info.selectionText),
diff --git a/manifest.json b/manifest.json
index 2865ffa..556b673 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
   "name": "__MSG_extName__", 
-  "version": "5.0.2",
+  "version": "5.1.0",
   "description": "__MSG_extDescription__",
   "options_ui": {
     "page": "html/menu_ui.html",