Defender is simply broken on 4.4. For more info you can check out this thread Block ads on Sailfish 4.4 Both sandboxing and other browser things have changed
New issues have been created too: Issues · peterleinchen/harbour-defender · GitHub
But Peter is not the original developer of Defender, he has been keeping it alive for some time, but if anyone could help with rewriting the Python code, it would be a massive help.
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