As what we have seen on bug 898156 the background thumbnail generation is causing crashes when the access to an FTP server happens through a proxy like squid, and it routes everything through HTTP. Given that we are the only ones who can have tests with proxies we should get such a test implemented. Those steps should be enough: 1. Setup a proxy which routes FTP through HTTP 2. Start Firefox and open an FTP page via the FTP protocol 3. As best restart Firefox and wait for a couple of seconds To get this implemented we need an open squid proxy first. This will be implemented via bug 917204.
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