diff --git a/ext/bg/data/options-schema.json b/ext/bg/data/options-schema.json
index 656da989..0379fa75 100644
--- a/ext/bg/data/options-schema.json
+++ b/ext/bg/data/options-schema.json
@@ -109,7 +109,8 @@
                                     "showPitchAccentDownstepNotation",
                                     "showPitchAccentPositionNotation",
                                     "showPitchAccentGraph",
-                                    "showIframePopupsInRootFrame"
+                                    "showIframePopupsInRootFrame",
+                                    "unsecurePopupFrameUrl"
                                 ],
                                 "properties": {
                                     "enable": {
@@ -247,6 +248,10 @@
                                     "showIframePopupsInRootFrame": {
                                         "type": "boolean",
                                         "default": false
+                                    },
+                                    "unsecurePopupFrameUrl": {
+                                        "type": "boolean",
+                                        "default": false
                                     }
                                 }
                             },
diff --git a/ext/bg/js/options.js b/ext/bg/js/options.js
index 35fdde82..97368a0b 100644
--- a/ext/bg/js/options.js
+++ b/ext/bg/js/options.js
@@ -176,7 +176,8 @@ function profileOptionsCreateDefaults() {
             showPitchAccentDownstepNotation: true,
             showPitchAccentPositionNotation: true,
             showPitchAccentGraph: false,
-            showIframePopupsInRootFrame: false
+            showIframePopupsInRootFrame: false,
+            unsecurePopupFrameUrl: false
         },
 
         audio: {
diff --git a/ext/bg/settings.html b/ext/bg/settings.html
index a530534c..118a13b9 100644
--- a/ext/bg/settings.html
+++ b/ext/bg/settings.html
@@ -182,6 +182,10 @@
                     <label><input type="checkbox" id="show-iframe-popups-in-root-frame" data-setting="general.showIframePopupsInRootFrame"> Show iframe popups in root frame</label>
                 </div>
 
+                <div class="checkbox options-advanced">
+                    <label><input type="checkbox" id="show-iframe-popups-in-root-frame" data-setting="general.unsecurePopupFrameUrl"> Use unsecure popup frame URL</label>
+                </div>
+
                 <div class="checkbox options-advanced">
                     <label><input type="checkbox" id="show-debug-info" data-setting="general.debugInfo" data-transform-pre="setDocumentAttribute" data-transform-post="setDocumentAttribute" data-document-attribute="data-options-general-debug-info"> Show debug information</label>
                 </div>
diff --git a/ext/fg/js/popup.js b/ext/fg/js/popup.js
index a8188143..af24989f 100644
--- a/ext/fg/js/popup.js
+++ b/ext/fg/js/popup.js
@@ -328,12 +328,18 @@ class Popup {
     async _createInjectPromise() {
         this._injectStyles();
 
+        const unsecurePopupFrameUrl = (this._options !== null && this._options.general.unsecurePopupFrameUrl);
         const {secret, token} = await this._initializeFrame(this._frame, this._targetOrigin, this._frameId, (frame) => {
             frame.removeAttribute('src');
             frame.removeAttribute('srcdoc');
             this._observeFullscreen(true);
             this._onFullscreenChanged();
-            frame.contentDocument.location.href = chrome.runtime.getURL('/fg/float.html');
+            const url = chrome.runtime.getURL('/fg/float.html');
+            if (unsecurePopupFrameUrl) {
+                frame.setAttribute('src', url);
+            } else {
+                frame.contentDocument.location.href = url;
+            }
         });
         this._frameSecret = secret;
         this._frameToken = token;