On the result page of the log-parser plugin - http://server/jenkins/job/name/30/parsed_console/? - log_ref.html - the images red.gif yellow.gif and blue.gif are linked by absolute http path instead of a relative path.

That is, the content of a log_ref.html file reads:
... <img src="http://server/jenkins///plugin/log-parser/images/red.gif" ...

The css files in the log_ref.html and log_content.html are also linked by absolute path.

As far as I can tell, this is unnecessary - relative paths should be sufficient for the iframe of log.html and for the frameset.

And it is confusing: If a server within an intranet can be referred to by "http://server/" as well as "http://server.company-domain.com/" and a user uses one of these variants, the other variant is not logged in and if the images / css are supplied via the other variant they won't be displayed.