properJavaRDP freezes in firefox 42.0 but is fine in 41.0.2, and was fine in 41.0
On connecting through firefox to customer VPN running/using properJavaRDP firefox freezes when v42.0 is used. Three dialogs have to be acknowledged before firefox becomes usable again.
Connection through firefox 41.0.2 is fine, as was v41.0. Dialogs not presented with either.
The only difference between working and not working is 41.0.2 v.s. 41.0.
Which version of the Java plug-in do you have?
You can check at https://www.java.com/en/download/installed.jsp?detect=jre
"Your Java version: Version 7 Update 21"
Please update to 8 update 66 and retry.
Let us know if this solves your problem.