Account for Dropbox bug

_locales/en/messages.json

@@ -445,6 +445,10 @@
     "message": "Press a hotkey",
     "description": "Placeholder text of inputbox in keymap help popup on the edit style page. Must be very short"
   },
+  "hostDisabled": {
+    "message": "This host has been disabled due to a bug in the current version of the browser being used",
+    "description": "Tooltip for cloud host disabled"
+  },
   "importAppendLabel": {
     "message": "Append to style",
     "description": "Label for the button to import a style and append to the existing sections"

options/options.js

@@ -9,6 +9,13 @@ setupRadioButtons();
 enforceInputRange($('#popupWidth'));
 setTimeout(splitLongTooltips);
 
+// TODO: add max version to re-enable once crbug.com/996859 is resolved
+if (!FIREFOX && CHROME >= 3809) {
+  const dropboxOption = $('option[value="dropbox"]');
+  dropboxOption.disabled = true;
+  dropboxOption.setAttribute('title', t('hostDisabled'));
+}
+
 if (CHROME_HAS_BORDER_BUG) {
   const borderOption = $('.chrome-no-popup-border');
   if (borderOption) {