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IRUnfilter 1.1.1-signed.1-signed Requires Restart
Removes Host http header from HTTP requests which actually bypasses Iran's web filtering
Get a free web proxy to use with it
Supports auto-proxy configuration for Bad Request (servers with multiple hosts) error.
About this Add-on
The post describes how Iran's content filtering searches only the "Host" HTTP header for filtered website URLs, so it removes this header.
It also switches itself off in HTTPS connections, since HTTPS requires the Host header.
Also supports automatic switching over to web proxy (enabled via its button in the toolbar), for those sites where IP addresses are filtered and you can't connect.