While certain browser extensions such as HTTPSEverywhere (rewrites requests to use HTTPS by default) and NoScript (optionally disables technologies like JavaScript, Java, Flash) can increase security, a browser such as Firefox or Chrome which is configured with security in mind cannot always provide sufficient security. The Tor Browser is an alternative, privacy-oriented browser developed by the Tor Project. It uses the Tor Network to attempt to ensure anonymity.

Tor Browser Bundle

The Tor Browser Bundle contains Tor, Vidalia, a modified Firefox ESR, and Torbutton.

  • Tor: a network of virtual tunnels that allows people and groups to improve their privacy and security on the Internet.
  • Vidalia: a cross-platform graphical controller for the Tor software, built using the Qt framework.
  • Firefox ESR: Firefox is a browser developed by Mozilla. ESR stands for "Extended Support Release."
  • Torbutton: the component in Tor Browser Bundle that takes care of application-level security and privacy concerns in Firefox.


  • Proxy Obedience: prevent browser from bypassing Tor proxy settings for any content
  • State Separation: prevent states from non-Tor activity from being combined with the Tor Browser state
  • Disk Avoidance: prevent browser activity from being written to disk, or from being stored in memory beyond the duration of the browsing session
  • Application Data Isolation: reduce and/or eliminate local traces of Tor activity
  • Cross-Origin Identifier Unlinkability:
  • Cross-Origin Fingerprinting Unlinkability: a user's activity on one site from being linked to their activity on another site
  • Long-Term Unlinkability:

Further Reading:

Last modified 6 years ago Last modified on Oct 2, 2013, 3:10:29 PM