JAR URLs have the following syntax
jar:
EXAMPLE: jar:http://www.big.com/blue.jar!/ocean.html
The nsIURL methods operate on the
Create a clone of the JAR URI with a new root URI (the URI for the
actual JAR file).
Returns the root URI (the one for the actual JAR file) for this JAR
(e.g., http://www.big.com/blue.jar).
Returns the entry specified for this JAR URI (e.g., “ocean.html”). This
value may contain %-escaped byte sequences.