diff --git a/PRIVACY.md b/PRIVACY.md
index c2f67118..06b02323 100644
--- a/PRIVACY.md
+++ b/PRIVACY.md
@@ -6,3 +6,7 @@ This means that:
 - It collects no user or usage data.
 - It does not read or modify any part of any site besides the contents of the focused edit control, and only when the user tells it to do so.
 - It makes no external requests at all. All rendering is done locally.
+
+## Optional third-party: LaTeX image rendering service
+
+If you choose to use _Markdown Here_'s LaTeX math rendering feature, the contents of your math equations will be sent to a third party to create the image containing your math. (That image is created at the time that the browser displays it, which is usually when the image element is inserted into the page). By default that third-party service is [CodeCodgs](https://www.codecogs.com/pages/agreements/privacy_policy.php) although [other services](https://github.com/adam-p/markdown-here/wiki/Tips-and-Tricks#tex) may be used.
diff --git a/src/common/options-store.js b/src/common/options-store.js
index bbf5d226..204f3e4c 100644
--- a/src/common/options-store.js
+++ b/src/common/options-store.js
@@ -17,7 +17,7 @@ if (typeof(Utils) === 'undefined' && typeof(Components) !== 'undefined') {
 
 // Common defaults
 var DEFAULTS = {
-  'math-enabled': true,
+  'math-enabled': false,
   'math-value': '<img src="https://latex.codecogs.com/png.image?\\dpi{120}\\inline&space;{urlmathcode}" alt="{mathcode}">',
   'hotkey': { shiftKey: false, ctrlKey: true, altKey: true, key: 'M' },
   'forgot-to-render-check-enabled': false,