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On Linux, there is a template for "External Browser (Command Line)" but none for "External Browser (UNIX)". I am not sure why - there are configurable props on the Unix browser type. (It is sensible not to have a template for the Swing browser type.) BTW note that "Unix" is probably preferred stylistically to "UNIX", as it is not an acronym but just a pun on Multics; maybe Patrick can comment.
Reassigning browser bugs
Well, I changed this. There's only one general template now, and the internal implementation (not visible to user) is chosen based on the executable, or operating system. So marking this as fixed.