Put firefox back in the manual after switching back to firefox.

source/2/2.1/2.1.1/firefox.rst

@@ -0,0 +1,32 @@
+Chapter 3.1.1: Firefox
+==============================
+
+Description
+---------------
+Firefox is a highly-rated, and secure web browser that is installed by default in Ubuntu.
+It is a decent choice if one wants a secure, fast, yet relatively less resource-heavy browser. 
+
+Firefox has features of other web browsers and its own ones, such as:
+ - Tab browsing
+ - Scroll through tabs
+ - Great plugins and add-ons
+ - Favorites, bookmarks, pocket
+ - Firefox account sync
+ - Master password
+ - UI customization with themes and toolbars
+ - Advanced customization with about:config
+ - Open source
+
+Usage/Screenshots
+----------------------
+.. image:: firefox-screenshot.png
+   :width: 80%
+
+Version
+----------
+Lubuntu currently ships with the latest version of Firefox, Firefox Quantum.
+
+How to launch
+----------------
+To open Firefox, click on the Firefox icon (red/orange fox covering a blue sphere) in the Lubuntu Menu.
+You can also type and run `firefox` in the terminal to open the browser.

source/2/2.1/Internet_Applications.rst

@@ -5,6 +5,6 @@ Chapter 2.1 Internet Applications
    :maxdepth: 2
    :titlesonly:
 
-   2.1.1/Falkon
+   2.1.1/firefox
    2.1.2/qtransmission
    2.1.3/Quasel_IRC