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This add-on is not compatible with your version of Thunderbird because of the following:
About this Add-on
In Thunderbird there is a bug which bypasses the proxy settings configured via a proxy auto-configuration (PAC) script for the very first connection after startup. ReloadPAC provides a workaround for this problem.
So if you use a SSH tunnel, the TOR privacy network or another SOCKS server configured via proxy auto-configuration, use this extension for your safety until the bug is fixed in Thunderbird!