misc/waterfox: add toolbar description

_misc/waterfox/toolbar.txt

@@ -0,0 +1,25 @@
+UI Customization
+----------------
+
+Toolbar:
+- Back
+- Forward
+- Reload
+- URL bar
+- Search bar
+- Downloads
+- Library
+- Waterfox Account
+- uBlock Origin
+- SmartHTTPS
+
+Overflow Menu:
+- Tree Style Tab
+- Forget
+- Developer
+- Tampermonkey
+- Custom UserAgent String
+- Copy Tab URLs
+- Open Multiple URLs
+- Simple WebSocket Client
+