Sets proxy settings from environment variables. This is mostly useful for Unix/Linux machines, where the proxy settings are set by environment variables like http_proxy, https_proxy etc. (Konqueror has a similar feature "Use preset proxy environment variables"). This makes it easier for administrators to control the proxy settings for several applications (gaim, konqueror, firefox, thunderbird etc.).
ATTENTION: Since Firefox 3.5 this add-on is no longer needed on Unix/Linux machines (see Bug 66057 https://bugzilla.mozilla.org/show_bug.cgi?id=66057). Just set your proxy settings to "Use System Settings" and you're set.
The default environment variables used are
These defaults can be changed in the preferences of this extension. If any of the environment variables are found, they are set in the proxy settings and used, if not found, a direct internet connection is used.