Updated Optional Hardening (markdown)

Optional-Hardening.md

@@ -229,22 +229,6 @@ user_pref("browser.eme.ui.enabled", false);
 
 ***
 
-### default-browser-agent
-On Windows, Mozilla [collects](https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/data/default-browser-ping.html) information on what you've set as your default browser.
-
-> [!WARNING]
-> Breaks **Make Default...** button to set Firefox as the default browser on Windows.
-
-> [!TIP]
-> Add this pref if you do not use this UI or if you have already set Firefox as the default browser.
-
-```javascript
-// PREF: disable telemetry of what default browser you use [WINDOWS]
-user_pref("default-browser-agent.enabled", false);
-```
-
-***
-
 ### Fingerprinting
 Fingerprinting is a high [threat model](https://thenewoil.org/en/guides/prologue/threatmodel/) issue that is only [addressed](https://github.com/arkenfox/user.js/wiki/3.3-Overrides-%5BTo-RFP-or-Not%5D#-fingerprinting) reasonably by Tor.<sup>[1](https://youtu.be/5NrbdO4yWek?t=4334)</sup> Please use the [Tor Browser](https://www.torproject.org) if your context calls for **anonymity** and not just reasonable **privacy**.<sup>^[*what's the difference?*](https://thenewoil.org/en/guides/prologue/secprivanon/)</sup>