firefox manual added. (#8)

source/3/3.1/3.1.1/firefox.rst

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+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: 40%
+
+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/3/3.1/internet_applications.rst

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+Chapter 3: Applications
+==============================
+
+This chapter will show you the various applications that ship with Lubuntu.
+
+.. toctree::
+   :maxdepth: 2
+   :titlesonly:
+
+   3.3/accesories