diff --git a/ext/bg/js/anki.js b/ext/bg/js/anki.js
index c327969f..183f37bc 100644
--- a/ext/bg/js/anki.js
+++ b/ext/bg/js/anki.js
@@ -62,7 +62,7 @@ class AnkiConnect {
         if (this.remoteVersion < this.localVersion) {
             this.remoteVersion = await this.ankiInvoke('version');
             if (this.remoteVersion < this.localVersion) {
-                throw 'extension and plugin versions incompatible';
+                throw 'Extension and plugin versions incompatible';
             }
         }
     }
diff --git a/ext/bg/js/audio.js b/ext/bg/js/audio.js
index 0952887e..ce47490c 100644
--- a/ext/bg/js/audio.js
+++ b/ext/bg/js/audio.js
@@ -57,7 +57,7 @@ async function audioBuildUrl(definition, mode, cache={}) {
                 const xhr = new XMLHttpRequest();
                 xhr.open('POST', 'https://www.japanesepod101.com/learningcenter/reference/dictionary_post');
                 xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
-                xhr.addEventListener('error', () => reject('failed to scrape audio data'));
+                xhr.addEventListener('error', () => reject('Failed to scrape audio data'));
                 xhr.addEventListener('load', () => {
                     cache[definition.expression] = xhr.responseText;
                     resolve(xhr.responseText);
@@ -87,7 +87,7 @@ async function audioBuildUrl(definition, mode, cache={}) {
             } else {
                 const xhr = new XMLHttpRequest();
                 xhr.open('GET', `http://jisho.org/search/${definition.expression}`);
-                xhr.addEventListener('error', () => reject('failed to scrape audio data'));
+                xhr.addEventListener('error', () => reject('Failed to scrape audio data'));
                 xhr.addEventListener('load', () => {
                     cache[definition.expression] = xhr.responseText;
                     resolve(xhr.responseText);
diff --git a/ext/bg/js/database.js b/ext/bg/js/database.js
index f94c572e..e7316b3a 100644
--- a/ext/bg/js/database.js
+++ b/ext/bg/js/database.js
@@ -25,7 +25,7 @@ class Database {
 
     async prepare() {
         if (this.db) {
-            throw 'database already initialized';
+            throw 'Database already initialized';
         }
 
         this.db = new Dexie('dict');
@@ -46,7 +46,7 @@ class Database {
 
     async purge() {
         if (!this.db) {
-            throw 'database not initialized';
+            throw 'Database not initialized';
         }
 
         this.db.close();
@@ -59,7 +59,7 @@ class Database {
 
     async findTerms(term, titles) {
         if (!this.db) {
-            throw 'database not initialized';
+            throw 'Database not initialized';
         }
 
         const results = [];
@@ -83,7 +83,7 @@ class Database {
 
     async findTermFreq(term, titles) {
         if (!this.db) {
-            throw 'database not initialized';
+            throw 'Database not initialized';
         }
 
         const results = [];
@@ -98,7 +98,7 @@ class Database {
 
     async findKanji(kanji, titles) {
         if (!this.db) {
-            return Promise.reject('database not initialized');
+            throw 'Database not initialized';
         }
 
         const results = [];
@@ -121,7 +121,7 @@ class Database {
 
     async findKanjiFreq(kanji, titles) {
         if (!this.db) {
-            throw 'database not initialized';
+            throw 'Database not initialized';
         }
 
         const results = [];
@@ -136,7 +136,7 @@ class Database {
 
     async findTagForTitle(name, title) {
         if (!this.db) {
-            throw 'database not initialized';
+            throw 'Database not initialized';
         }
 
         this.tagCache[title] = this.tagCache[title] || {};
@@ -159,23 +159,23 @@ class Database {
         if (this.db) {
             return this.db.dictionaries.toArray();
         } else {
-            throw 'database not initialized';
+            throw 'Database not initialized';
         }
     }
 
     async importDictionary(archive, callback) {
         if (!this.db) {
-            return Promise.reject('database not initialized');
+            throw 'Database not initialized';
         }
 
         const indexDataLoaded = async summary => {
             if (summary.version > 2) {
-                throw 'unsupported dictionary version';
+                throw 'Unsupported dictionary version';
             }
 
             const count = await this.db.dictionaries.where('title').equals(summary.title).count();
             if (count > 0) {
-                throw `dictionary "${summary.title}" is already imported`;
+                throw 'Dictionary is already imported';
             }
 
             await this.db.dictionaries.add(summary);
@@ -329,12 +329,12 @@ class Database {
 
         const indexFile = zip.files['index.json'];
         if (!indexFile) {
-            throw 'no dictionary index found in archive';
+            throw 'No dictionary index found in archive';
         }
 
         const index = JSON.parse(await indexFile.async('string'));
         if (!index.title || !index.revision) {
-            throw 'unrecognized dictionary format';
+            throw 'Unrecognized dictionary format';
         }
 
         const summary = {
diff --git a/ext/bg/js/request.js b/ext/bg/js/request.js
index 94fd135a..e4359863 100644
--- a/ext/bg/js/request.js
+++ b/ext/bg/js/request.js
@@ -22,7 +22,7 @@ function requestJson(url, action, params) {
         const xhr = new XMLHttpRequest();
         xhr.overrideMimeType('application/json');
         xhr.addEventListener('load', () => resolve(xhr.responseText));
-        xhr.addEventListener('error', () => reject('failed to execute network request'));
+        xhr.addEventListener('error', () => reject('Failed to connect'));
         xhr.open(action, url);
         if (params) {
             xhr.send(JSON.stringify(params));
@@ -34,7 +34,7 @@ function requestJson(url, action, params) {
             return JSON.parse(responseText);
         }
         catch (e) {
-            return Promise.reject('invalid JSON response');
+            return Promise.reject('Invalid response');
         }
     });
 }
diff --git a/ext/bg/js/settings.js b/ext/bg/js/settings.js
index d73d7509..161e9abe 100644
--- a/ext/bg/js/settings.js
+++ b/ext/bg/js/settings.js
@@ -142,7 +142,7 @@ async function onReady() {
     $('#scan-length').val(options.scanning.length);
     $('#scan-modifier-key').val(options.scanning.modifier);
 
-    $('#dict-purge').click(utilAsync(onDictionaryPurge));
+    $('#dict-purge-link').click(utilAsync(onDictionaryPurge));
     $('#dict-file').change(utilAsync(onDictionaryImport));
 
     $('#anki-enable').prop('checked', options.anki.enable);
@@ -179,7 +179,7 @@ $(document).ready(utilAsync(onReady));
 function dictionaryErrorShow(error) {
     const dialog = $('#dict-error');
     if (error) {
-        dialog.show().find('span').text(error);
+        dialog.show().text(error);
     } else {
         dialog.hide();
     }
@@ -245,7 +245,7 @@ async function onDictionaryPurge(e) {
     e.preventDefault();
 
     const dictControls = $('#dict-importer, #dict-groups').hide();
-    const dictProgress = $('#dict-purge-progress').show();
+    const dictProgress = $('#dict-purge').show();
 
     try {
         dictionaryErrorShow();
@@ -314,7 +314,7 @@ function ankiSpinnerShow(show) {
 function ankiErrorShow(error) {
     const dialog = $('#anki-error');
     if (error) {
-        dialog.show().find('span').text(error);
+        dialog.show().text(error);
     }
     else {
         dialog.hide();
diff --git a/ext/bg/settings.html b/ext/bg/settings.html
index c2612967..4315d74b 100644
--- a/ext/bg/settings.html
+++ b/ext/bg/settings.html
@@ -7,7 +7,7 @@
         <link rel="stylesheet" type="text/css" href="/mixed/lib/bootstrap/css/bootstrap-theme.min.css">
         <style>
             #anki-spinner, #anki-general, #anki-error,
-            #dict-spinner, #dict-error, #dict-warning, #dict-purge-progress, #dict-import-progress,
+            #dict-spinner, #dict-error, #dict-warning, #dict-purge, #dict-import-progress,
             #debug, .options-advanced {
                 display: none;
             }
@@ -129,24 +129,16 @@
 
                 <p class="help-block">
                     Yomichan can import and use a variety of dictionary formats. Unneeded dictionaries can be disabled,
-                    or you can simply <a href="#" id="dict-purge">purge the database</a> to delete everything.
+                    or you can simply <a href="#" id="dict-purge-link">purge the database</a> to delete everything.
                 </p>
                 <p class="help-block">
                     Please visit the <a href="https://foosoft.net/projects/yomichan" target="_blank">Yomichan</a> homepage to download free
                     dictionaries that you can use with this extension.
                 </p>
 
-                <div id="dict-purge-progress" class="text-danger">Dictionary data is being purged, please be patient...</div>
-
-                <div class="alert alert-warning" id="dict-warning">
-                    <strong>Warning:</strong>
-                    <span>no dictionaries found; please use the importer below to install packaged dictionaries</span>
-                </div>
-
-                <div class="alert alert-danger" id="dict-error">
-                    <strong>Error:</strong>
-                    <span></span>
-                </div>
+                <div class="text-danger" id="dict-purge">Dictionary data is being purged, please be patient...</div>
+                <div class="alert alert-warning" id="dict-warning">No dictionaries have been installed</div>
+                <div class="alert alert-danger" id="dict-error"></div>
 
                 <div id="dict-groups"></div>
 
@@ -174,10 +166,7 @@
                     <a href="https://foosoft.net/projects/anki-connect/" target="_blank">AnkiConnect</a> plugin.
                 </p>
 
-                <div class="alert alert-danger" id="anki-error">
-                    <strong>Error:</strong>
-                    <span></span>
-                </div>
+                <div class="alert alert-danger" id="anki-error"></div>
 
                 <div class="checkbox">
                     <label><input type="checkbox" id="anki-enable"> Enable Anki integration</label>
diff --git a/ext/mixed/js/display.js b/ext/mixed/js/display.js
index 47efd195..75ee339a 100644
--- a/ext/mixed/js/display.js
+++ b/ext/mixed/js/display.js
@@ -32,11 +32,11 @@ class Display {
     }
 
     onError(error) {
-        throw 'override me';
+        throw 'Override me';
     }
 
     onSearchClear() {
-        throw 'override me';
+        throw 'Override me';
     }
 
     onSourceTermView(e) {
@@ -350,7 +350,7 @@ class Display {
                 Display.adderButtonFind(index, mode).addClass('disabled');
                 Display.viewerButtonFind(index).removeClass('pending disabled').data('noteId', noteId);
             } else {
-                throw 'note could note be added';
+                throw 'Note could note be added';
             }
         } catch (e) {
             this.onError(e);