This is about stopping the dreaded disease, Data Diarrhea. The websites you visit can leave behind a trail of data on your computer and in their server logs. All of this Data Diarrhea can identify the Investigator and this can complicate the problem he is trying to solve. Lax privacy & configuration settings may also leave the Investigator’s computer vulnerable to attack by hackers.
This article describes more advanced methods of customizing Mozilla applications, by editing the configuration files.
about:config is a feature of Mozilla applications which lists application settings (known as preferences) that are read from the profile files prefs.js and user.js, and from application defaults. Many of these preferences are not present in the Options or Preferences dialog. Using about:config is one of several methods of modifying preferences and adding other “hidden” ones.
Editing the user.js and prefs.js files are an alternative method of modifying preferences and recommended for very advanced users only. Unless you need a prefs.js and/or user.js file modified for a specific purpose, you should use about:config instead.
This article refers to the Firefox V. 9 edition of the browser. These entries may have adverse effects on Thunderbird and Mozilla Suite/SeaMonkey and older versions of Firefox. These settings will affect all profiles of the browser.
In Firefox, type about:config in the Location Bar (address bar) and press Enter to display the list of preferences. You may get a warning page next, just click OK and move on.
about:config > browser.display.use_document_fonts > change value to 0
0: Never use document’s fonts
1: Allow documents to specify fonts to use
2: Always use document’s fonts (deprecated)
Don’t let the site access to the fonts on your computer. That grants too much access that can be abused.
about:config > browser.sessionhistory.max_entries > change value to 2
The maximum number of pages in the browser’s session history, i.e. the maximum number of URLs you can traverse purely through the Back/Forward buttons. Default value is 50. Set it to 2 so that the site you visit can’t see where you have been during your Investigative Internet Research (IIR) assignment.
about:config > dom.storage.enabled > double click to false
dom.storage.enabled is a mechanism allowing web pages to store information with a web browser (similar to cookies) called “client-side session and persistent storage.” Although use of session storage is subject to a user’s cookie preferences, this preference allows it to be disabled entirely.
about:config > geo.enabled > double click to false
True is location aware browsing enabled. Default is true. You want to disable this. See http://www.mozilla.com/en-US/firefox/geolocation/ for details of geolocation in Firefox.