diff --git a/addon/chrome/content/lib/css/copy-tex.css b/addon/chrome/content/lib/css/copy-tex.css
new file mode 100644
index 0000000..6999c63
--- /dev/null
+++ b/addon/chrome/content/lib/css/copy-tex.css
@@ -0,0 +1,13 @@
+/* Force selection of entire .katex/.katex-display blocks, so that we can
+ * copy/paste the entire source code.  If you omit this CSS, partial
+ * selections of a formula will work, but will copy the ugly HTML
+ * representation instead of the LaTeX source code.  (Full selections will
+ * still produce the LaTeX source code.)
+ */
+.katex,
+.katex-display {
+    -webkit-user-select: all;
+       -moz-user-select: all;
+            user-select: all;
+}
+
diff --git a/addon/chrome/content/lib/js/copy-tex.min.js b/addon/chrome/content/lib/js/copy-tex.min.js
new file mode 100644
index 0000000..9e9d26e
--- /dev/null
+++ b/addon/chrome/content/lib/js/copy-tex.min.js
@@ -0,0 +1 @@
+!function(e,t){if("object"==typeof exports&&"object"==typeof module)module.exports=t();else if("function"==typeof define&&define.amd)define([],t);else{var n=t();for(var l in n)("object"==typeof exports?exports:e)[l]=n[l]}}("undefined"!=typeof self?self:this,(function(){return function(){"use strict";var e={},t={inline:["$","$"],display:["$$","$$"]},n=function(e,n){void 0===n&&(n=t);for(var l=e.querySelectorAll(".katex-mathml + .katex-html"),r=0;r<l.length;r++){var i=l[r];i.remove?i.remove(null):i.parentNode.removeChild(i)}for(var o=e.querySelectorAll(".katex-mathml"),a=0;a<o.length;a++){var d=o[a],f=d.querySelector("annotation");f&&(d.replaceWith?d.replaceWith(f):d.parentNode.replaceChild(f,d),f.innerHTML=n.inline[0]+f.innerHTML+n.inline[1])}for(var c=e.querySelectorAll(".katex-display annotation"),s=0;s<c.length;s++){var p=c[s];p.innerHTML=n.display[0]+p.innerHTML.substr(n.inline[0].length,p.innerHTML.length-n.inline[0].length-n.inline[1].length)+n.display[1]}return e};return document.addEventListener("copy",(function(e){var t=window.getSelection();if(!t.isCollapsed){var l=t.getRangeAt(0).cloneContents();if(l.querySelector(".katex-mathml")){for(var r=[],i=0;i<l.childNodes.length;i++)r.push(l.childNodes[i].outerHTML);e.clipboardData.setData("text/html",r.join("")),e.clipboardData.setData("text/plain",n(l).textContent),e.preventDefault()}}})),e=e.default}()}));
\ No newline at end of file
diff --git a/src/events.ts b/src/events.ts
index 47a0f65..d1a0654 100644
--- a/src/events.ts
+++ b/src/events.ts
@@ -9,7 +9,7 @@ class AddonEvents extends AddonBase {
       notify: async (
         event: string,
         type: string,
-        ids: Array<string>,
+        ids: Array<number>,
         extraData: object
       ) => {
         if (event === "modify" && type === "item") {
@@ -338,22 +338,15 @@ class AddonEvents extends AddonBase {
         });
       }
 
-      const switchTexButton: Element = await this._Addon.views.addEditorButton(
+      await this._Addon.views.addEditorButton(
         message.content.editorInstance,
         "knowledge-switchTex",
         "switchTex",
         `LaTex View    ${Zotero.isWin ? "Ctrl" : "⌘"}+/`,
-        "switchTex",
+        "switchEditorTex",
         "middle",
         "builtin"
       );
-      switchTexButton.addEventListener("click", (e) => {
-        this.onEditorEvent(
-          new EditorMessage("switchEditorTex", {
-            editorInstance: message.content.editorInstance,
-          })
-        );
-      });
 
       message.content.editorInstance._iframeWindow.document.addEventListener(
         "keyup",
@@ -404,7 +397,35 @@ class AddonEvents extends AddonBase {
       );
       _window.document.body.append(texStyle);
 
+      const copytexStyle = _window.document.createElement("link");
+      copytexStyle.setAttribute("rel", "stylesheet");
+      copytexStyle.setAttribute(
+        "href",
+        "chrome://Knowledge4Zotero/content/lib/css/copy-tex.css"
+      );
+      _window.document.body.append(copytexStyle);
+
+      const copytexScript = _window.document.createElement("script");
+      copytexScript.setAttribute(
+        "src",
+        "chrome://Knowledge4Zotero/content/lib/js/copy-tex.min.js"
+      );
+      _window.document.head.append(copytexScript);
+
       message.content.editorInstance._knowledgeUIInitialized = true;
+
+      if (
+        this._Addon.views._texNotes.includes(
+          message.content.editorInstance._item.id
+        )
+      ) {
+        this.onEditorEvent(
+          new EditorMessage("switchEditorTex", {
+            editorInstance: message.content.editorInstance,
+            params: { viewTex: true },
+          })
+        );
+      }
     } else if (message.type === "enterWorkspace") {
       /*
         message.content = {
@@ -482,11 +503,15 @@ class AddonEvents extends AddonBase {
     } else if (message.type === "switchEditorTex") {
       /*
         message.content = {
-          editorInstance
+          editorInstance, params: {viewTex: boolean}
         }
       */
       const instance = message.content.editorInstance;
-      if (!instance._viewTex) {
+      let viewTex = false;
+      if (message.content.params && message.content.params.viewTex) {
+        viewTex = true;
+      }
+      if (!this._Addon.views._texNotes.includes(instance._item.id) || viewTex) {
         const editorElement =
           instance._iframeWindow.document.getElementsByClassName(
             "primary-editor"
@@ -494,6 +519,7 @@ class AddonEvents extends AddonBase {
         if (!editorElement) {
           return;
         }
+        Zotero.debug("Knowledge4Zotero: latex view on.");
         const viewNode = editorElement.cloneNode(true) as HTMLElement;
         renderMathInElement(viewNode, {
           // customised options
@@ -507,7 +533,6 @@ class AddonEvents extends AddonBase {
           // • rendering keys, e.g.:
           throwOnError: false,
         });
-        instance._viewTex = true;
         this._Addon.views.switchEditorTexView(instance, true, viewNode);
         this._Addon.views.changeEditorButtonView(
           instance._iframeWindow.document.getElementById("knowledge-switchTex"),
@@ -515,7 +540,7 @@ class AddonEvents extends AddonBase {
           `Editor View    ${Zotero.isWin ? "Ctrl" : "⌘"}+/`
         );
       } else {
-        instance._viewTex = false;
+        Zotero.debug("Knowledge4Zotero: latex view off.");
         this._Addon.views.switchEditorTexView(instance, false);
         this._Addon.views.changeEditorButtonView(
           instance._iframeWindow.document.getElementById("knowledge-switchTex"),
diff --git a/src/views.ts b/src/views.ts
index 55e65d1..2e51f61 100644
--- a/src/views.ts
+++ b/src/views.ts
@@ -5,6 +5,7 @@ class AddonViews extends AddonBase {
   editorIcon: object;
   currentOutline: OutlineType;
   _initIframe: any;
+  _texNotes: number[];
 
   constructor(parent: Knowledge4Zotero) {
     super(parent);
@@ -28,6 +29,7 @@ class AddonViews extends AddonBase {
     };
     this.currentOutline = OutlineType.treeView;
     this._initIframe = Zotero.Promise.defer();
+    this._texNotes = [];
   }
 
   getEditor(_document: Document) {
@@ -188,15 +190,35 @@ class AddonViews extends AddonBase {
       "editor-core"
     )[0] as HTMLElement;
     if (showView) {
+      if (!this._texNotes.includes(instance._item.id)) {
+        this._texNotes.push(instance._item.id);
+      }
+      let oldView = instance._iframeWindow.document.getElementById("texView");
+      while (oldView) {
+        oldView.remove();
+        oldView = instance._iframeWindow.document.getElementById("texView");
+      }
       viewNode.setAttribute("id", "texView");
       viewNode.style.height = "100%";
       viewNode.style.padding = "20px 30px 20px 30px";
       viewNode.style.overflowY = "auto";
       viewNode.removeAttribute("contentEditable");
+      Array.prototype.forEach.call(
+        viewNode.getElementsByTagName("a"),
+        (e: HTMLElement) => {
+          e.addEventListener("click", (ev) => {
+            ZoteroPane.loadURI(e.getAttribute("href"));
+          });
+        }
+      );
+
       editorCore.after(viewNode);
       editorCore.style.visibility = "hidden";
       viewNode.scrollTop = editorCore.scrollTop;
     } else {
+      if (this._texNotes.includes(instance._item.id)) {
+        this._texNotes.splice(this._texNotes.indexOf(instance._item.id), 1);
+      }
       const texView = instance._iframeWindow.document.getElementById("texView");
       if (texView) {
         editorCore.scrollTop = texView.scrollTop;
@@ -243,7 +265,13 @@ class AddonViews extends AddonBase {
     }
 
     // @ts-ignore
-    editor.parentNode.scrollTo(0, editor.children[lineIndex].offsetTop);
+    const scrollNum = editor.children[lineIndex].offsetTop;
+    (editor.parentNode as HTMLElement).scrollTo(0, scrollNum);
+
+    const texView = instance._iframeWindow.document.getElementById("texView");
+    if (texView) {
+      texView.scrollTo(0, scrollNum);
+    }
   }
 
   addNewKnowledgeButton() {