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In some situations (e.g. when the user manages the server + deployment to the server externally outside of the IDE), it may be useful to open the web browser to enable Easel features (visual CSS editing and JavaScript debugging), without performing the deployment part. So it would be useful to provide an option to skip deployment on Run action and just open the browser (i.e. the opposite of the Display Browser on Run checkbox that's present in project properties). Such an option could be either a UI checkbox in the project properties, or just a documented property that the user would be advised to manually put into project.properties. This applies to both Ant and Maven projects. For completeness, a possible alternative approach to addressing this need is to provide a special "dummy" server plugin that would not do any deployment on Run.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss