Doc: Dev README - TOC

docs/README.md

@@ -8,7 +8,9 @@
   * [Environment](#environment)
   * [Project Structure](#project-structure)
   * [Rules](#rules)
-- [Policies](#policies)
+- [Advanced Customizing](#advanced-customizing)
+  * [Policies](#policies)
+  * [Preference](#preference)
 - [User Custom CSS](#user-custom-css)
   * [Basics](#basics-1)
   * [Restrictions](#restrictions)
@@ -75,10 +77,14 @@ This is a rough guideline. (Not forced)
 
 - [Rules.md](./Rules.md).
 
-## Policies
+## Advanced Customizing
+### Policies
 - [Support Mozilla: Policies overview](https://support.mozilla.org/en-US/products/firefox-enterprise/policies-customization-enterprise/policies-overview-enterprise)
 - [Policy Templates](https://github.com/mozilla/policy-templates)
 
+### Preference
+- [Preference.md](./Preference.md).
+
 ## User Custom CSS
 ### Basics
 `userChrome.css` file is for browser UI, `userContent.css` file is for web contents.

docs/omni_ja.md

@@ -18,6 +18,7 @@
 - [How to Optimize or Deoptimize Firefox OMNI.JA File](https://www.raymond.cc/blog/edit-files-inside-firefox-4-omni-jar-to-auto-save-password/)
 
 **Explanation**
+
 Firefox achieve performance improvements by moving many of their internal parts from being standalone files or sets of JAR files into just one JAR file called `omni.ja`.  
 This reduces the amount of I/O needed to load the application.