diff --git a/FIREFOX.md b/FIREFOX.md
index 35f7881..d3813fa 100644
--- a/FIREFOX.md
+++ b/FIREFOX.md
@@ -1,28 +1,42 @@
-## Firefox themes
+# Firefox themes
+
+## Default (grays)
 ![Monobiome dark](images/firefox/monobiome-dark.png)
+
 [_Monobiome dark_][4]
 
 ![Monobiome light](images/firefox/monobiome-light.png)
+
 [_Monobiome light_][5]
 
+## Grassland biome
 ![Grassland monobiome dark](images/firefox/grassland-monobiome-dark.png)
+
 [_Grassland monobiome dark_][6]
 
 ![Grassland monobiome light](images/firefox/grassland-monobiome-light.png)
+
 [_Grassland monobiome light_][6]
 
+## Tundra biome
 ![Tundra monobiome dark](images/firefox/tundra-monobiome-dark.png)
+
 [_Tundra monobiome dark_][8]
 
 ![Tundra monobiome light](images/firefox/tundra-monobiome-light.png)
+
 [_Tundra monobiome light_][9]
 
+## Savanna biome
 ![Savanna monobiome dark](images/firefox/savanna-monobiome-dark.png)
+
 [_Savanna monobiome dark_][10]
 
 ![Savanna monobiome light](images/firefox/savanna-monobiome-light.png)
+
 [_Savanna monobiome light_][11]
 
+
 [4]: https://addons.mozilla.org/en-US/firefox/addon/monobiome-dark/ 
 [5]: https://addons.mozilla.org/en-US/firefox/addon/monobiome-light/ 
 [6]: https://addons.mozilla.org/en-US/firefox/addon/grassland-monobiome-dark/