diff --git a/Appendix-B:-Firefox-Add-ons.md b/Appendix-B:-Firefox-Add-ons.md
index 2c6206d..92f4ae7 100644
--- a/Appendix-B:-Firefox-Add-ons.md
+++ b/Appendix-B:-Firefox-Add-ons.md
@@ -22,6 +22,8 @@ These are all, where applicable, best configured to `deny-all` and whitelist.
 * [Cookie Controller](https://addons.mozilla.org/en-US/firefox/addon/cookie-controller/) <sup>1</sup>
 * :pushpin: [Self-Destructing Cookies](https://addons.mozilla.org/en-US/firefox/addon/self-destructing-cookies/) <sup>1</sup>
 * [HTTPS Everywhere](https://addons.mozilla.org/en-US/firefox/addon/https-everywhere/)
+* [HTTPS by default](https://addons.mozilla.org/en-US/firefox/addon/https-by-default/)
+  * changes the behavior for schemeless URLs typed in the location bar
 * [CanvasBlocker](https://addons.mozilla.org/en-US/firefox/addon/canvasblocker/)
 * [No Resource URI Leak](https://addons.mozilla.org/en-US/firefox/addon/no-resource-uri-leak/)
 * :pushpin: :triangular_flag_on_post: [NoRedirect](https://addons.mozilla.org/en-US/firefox/addon/noredirect/)