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Firefox 54 does not start Cisco AnyConnect VPN

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After upgrade Firefox 53.0.3 -> 54.0 AnyConnect Secure Mobility Client app does not start after fill-in credentials on VPN web page and accept all java warnings. (using Java detection) I got error Web-based installation was unsuccessful. After downgrade to 53.0.3 everything works well. did sth change in this version what can cause that problem? Thank you!

After upgrade Firefox 53.0.3 -> 54.0 AnyConnect Secure Mobility Client app does not start after fill-in credentials on VPN web page and accept all java warnings. (using Java detection) I got error Web-based installation was unsuccessful. After downgrade to 53.0.3 everything works well. did sth change in this version what can cause that problem? Thank you!

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Does not on FF 54.0.1 as well :(