diff --git a/chrome/thunderlink/content/preferences.js b/chrome/thunderlink/content/preferences.js
index 60f5dbc..dd2c362 100755
--- a/chrome/thunderlink/content/preferences.js
+++ b/chrome/thunderlink/content/preferences.js
@@ -24,6 +24,7 @@ var ThunderLinkPrefNS = {
       tTextbox.setAttribute("id", "prefCustomTlString" + cstrnum + "-title");
       tTextbox.setAttribute("preference", "prefs_customTlString" + cstrnum + "title");
       tTextbox.setAttribute("size", 51);
+      tTextbox.setAttribute("value", ThunderLinkPrefNS.GetPreferenceValue("custom-tl-string-" + cstrnum + "-title", "string"));
       var tLabel = window.document.createElementNS(XUL_NS, "label");
       tLabel.setAttribute("label", "Custom String title:");
       tLabel.setAttribute("control", tTextbox.id);
@@ -36,6 +37,7 @@ var ThunderLinkPrefNS = {
       csTextbox.setAttribute("multiline", "true");
       csTextbox.setAttribute("cols", "50");
       csTextbox.setAttribute("rows", "5");
+      csTextbox.setAttribute("value", ThunderLinkPrefNS.GetPreferenceValue("custom-tl-string-" + cstrnum, "string"));
       var csLabel = window.document.createElementNS(XUL_NS, "label");
       csLabel.setAttribute("label", "Custom String:");
       csLabel.setAttribute("control", csTextbox.id);
@@ -124,7 +126,7 @@ var ThunderLinkPrefNS = {
     var prefService = Components.classes["@mozilla.org/preferences-service;1"]
       .getService(Components.interfaces.nsIPrefService)
       .getBranch("extensions.thunderlink.");
-    prefService.QueryInterface(Components.interfaces.nsIPrefBranch);
+    // prefService.QueryInterface(Components.interfaces.nsIPrefBranch);
 
     console.log("Looking for pref " + prefname + " / is it bool? " + bool);
     var prefValue = "";
diff --git a/chrome/thunderlink/content/thunderlink.js b/chrome/thunderlink/content/thunderlink.js
index 1b82e44..e034186 100755
--- a/chrome/thunderlink/content/thunderlink.js
+++ b/chrome/thunderlink/content/thunderlink.js
@@ -67,11 +67,12 @@ var ThunderLinkChromeNS = {
     var keywords = hdr.getStringProperty("keywords");
     console.log("TagEmail: cur keywords: " + keywords);
 
-    function addKeywordToList(keywords, keywordIx) {
-      var keyword = "$label" + keywordIx;
-      if (keywords.contains(keyword)) return keywords;
-      keywords += " " + keyword;
-      return keywords;
+    function addKeywordToList(addKeywords, addKeywordIx) {
+      var keyword = "$label" + addKeywordIx;
+      if (addKeywords.contains(keyword)) return addKeywords;
+      // eslint-disable-next-line no-param-reassign
+      addKeywords += " " + keyword;
+      return addKeywords;
     }
     var msg = Components.classes["@mozilla.org/array;1"]
       .createInstance(Components.interfaces.nsIMutableArray);
diff --git a/components/thunderlinkCommandLineHandler.js b/components/thunderlinkCommandLineHandler.js
index 7d6b5c4..d823c07 100755
--- a/components/thunderlinkCommandLineHandler.js
+++ b/components/thunderlinkCommandLineHandler.js
@@ -57,7 +57,7 @@ var thunderlinkCommandLineHandler = {
         if (messageIDIndex !== -1) {
           // messageID parameter
           // Convert the message URI into a folder URI
-          const folderURI = mailURL.slice(0, messageIDIndex).replace("thunderlink", "mailbox");
+          // const folderURI = mailURL.slice(0, messageIDIndex).replace("thunderlink", "mailbox");
           // console.log("folderURI is " + folderURI);
           // Get the message ID
           messageID = mailURL.slice(messageIDIndex + MESSAGE_ID_PARAM.length);
@@ -69,7 +69,7 @@ var thunderlinkCommandLineHandler = {
           // Make sure the folder tree is initialized
           MailUtils.discoverFolders();
 
-          let folder = MailUtils.getFolderForURI(folderURI, true);
+          // let folder = MailUtils.getFolderForURI(folderURI, true);
           // The folder might not exist, so guard against that
           // if (folder && messageID.length > 0)
           //  msgHdr = folder.msgDatabase.getMsgHdrForMessageID(messageID);
@@ -92,7 +92,8 @@ var thunderlinkCommandLineHandler = {
         // console.log("null msgHdr but messageID exists");
         const accountManager = Cc["@mozilla.org/messenger/account-manager;1"].getService(Ci.nsIMsgAccountManager);
         const folders = accountManager.allFolders;
-        for (let msgFolder of fixIterator(folders.enumerate(), Ci.nsIMsgFolder)) {
+        // eslint-disable-next-line no-restricted-syntax
+        for (const msgFolder of fixIterator(folders.enumerate(), Ci.nsIMsgFolder)) {
           try {
             msgHdr = msgFolder.msgDatabase.getMsgHdrForMessageID(messageID);
             if (msgHdr !== null) {
@@ -150,7 +151,7 @@ var thunderlinkCommandLineHandler = {
   flags: Ci.nsIClassInfo.SINGLETON,
   getHelperForLanguage: function getHelperForLanguage(languageIgnored) { },
   getInterfaces: function getInterfaces(count) {
-    let interfaces = [Ci.nsICommandLineHandler];
+    const interfaces = [Ci.nsICommandLineHandler];
     count.value = interfaces.length;
     return interfaces;
   },
diff --git a/defaults/preferences/thunderlink.js b/defaults/preferences/thunderlink.js
index f32e3aa..93f752a 100755
--- a/defaults/preferences/thunderlink.js
+++ b/defaults/preferences/thunderlink.js
@@ -1,3 +1,4 @@
+/* eslint-disable no-undef */
 /*
    ThunderLink.
    Link from your browser to your email messages!
@@ -6,7 +7,7 @@
 
    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/. 
+   file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 pref("extensions.thunderlink.custom-tl-string-1-title", "thunderlink");
 pref("extensions.thunderlink.custom-tl-string-1", "<thunderlink>");
diff --git a/install.rdf b/install.rdf
index 0d33223..494e418 100755
--- a/install.rdf
+++ b/install.rdf
@@ -6,12 +6,12 @@
     <em:name>ThunderLink</em:name>
     <em:version>1.2.2-beta3</em:version>
     <em:creator>Christoph Zwirello and others</em:creator>
-    <em:description>Link from your browser to your email messages!</em:description>
+    <em:description>Create and use links to specific email messages!</em:description>
     <em:optionsURL>chrome://thunderlink/content/preferences.xul</em:optionsURL>
     <em:targetApplication>
       <Description>
         <em:id>{3550f703-e582-4d05-9a08-453d09bdfdc6}</em:id> <!-- Thunderbird -->
-        <em:minVersion>5.0</em:minVersion>
+        <em:minVersion>60.0</em:minVersion>
         <em:maxVersion>60.*</em:maxVersion>
       </Description>
     </em:targetApplication>