diff --git a/ext/bg/js/yomichan.js b/ext/bg/js/yomichan.js
index 172bb1d3..7be67d01 100644
--- a/ext/bg/js/yomichan.js
+++ b/ext/bg/js/yomichan.js
@@ -35,19 +35,23 @@ window.yomichan = new class {
     }
 
     optionsSet(options) {
-        this.options = options;
+        // In Firefox, setting options from the options UI somehow carries references
+        // to the DOM across to the background page, causing the options object to
+        // become a "DeadObject" after the options page is closed. The workaround used
+        // here is to create a deep copy of the options object.
+        this.options = JSON.parse(JSON.stringify(options));
 
-        if (!options.general.enable) {
+        if (!this.options.general.enable) {
             chrome.browserAction.setBadgeBackgroundColor({color: '#d9534f'});
             chrome.browserAction.setBadgeText({text: 'off'});
-        } else if (!dictConfigured(options)) {
+        } else if (!dictConfigured(this.options)) {
             chrome.browserAction.setBadgeBackgroundColor({color: '#f0ad4e'});
             chrome.browserAction.setBadgeText({text: '!'});
         } else {
             chrome.browserAction.setBadgeText({text: ''});
         }
 
-        if (options.anki.enable) {
+        if (this.options.anki.enable) {
             this.anki = new AnkiConnect(this.options.anki.server);
         } else {
             this.anki = new AnkiNull();
diff --git a/ext/manifest.json b/ext/manifest.json
index 5882f684..e6c709dd 100644
--- a/ext/manifest.json
+++ b/ext/manifest.json
@@ -1,7 +1,7 @@
 {
     "manifest_version": 2,
     "name": "Yomichan",
-    "version": "1.1.14",
+    "version": "1.1.15",
 
     "description": "Japanese dictionary with Anki integration",
     "icons": {"16": "mixed/img/icon16.png", "48": "mixed/img/icon48.png", "128": "mixed/img/icon128.png"},