This page lists known usability issues with the Tor Browser without reference to bug tickets. Fixed issues should be removed. This page should be formatted periodically into a mallard page for the [Tor Browser User Manual](https://gitweb.torproject.org/tor-browser/user-manual.git). Maintaining this page as a wiki will allow each support assistant to update it easily and quickly as he or she is alerted to new issues through [RT](https://rt.torproject.org/).

These known issues pertain to Tor Browser only and not to other Tor Project software. Tor known issues may be included only if they affect Tor Browser usability.

----
# Known Issues
 * Tor needs your system clock (and your time zone) to have the correct time. 
 * The following firewall software have been known to interfere with Tor and may need to be temporarily disabled:
   * Webroot
   * Kaspersky Internet Security 2012
   * Sophos
   * Microsoft Security Essentials
 * Videos that require Adobe Flash are unavailable. Flash is disabled for security reasons. Most YouTube videos can be played with HTML5 by visiting the video's "Embed" → "Share" link.
 * Tor can not use a bridge if a proxy is set.
 * The Tor Browser package is dated January 1, 2000 00:00:00 UTC. This is to ensure that each software build is exactly reproducible.
 * To run Tor Browser on Ubuntu, users need to execute a shell script. Open "Files" (Unity's explorer), open Preferences → Behavior Tab → Set "Run executable text files when they are opened" to "Ask every time", then OK. Tor Browser can also be started from the command line by running

```
./start-tor-browser
```
  from inside the Tor Browser directory.


If you've encountered an issue not on this list, email help@rt.torproject.org.