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There is no way how to just browse javadoc of some library in IDE. I added two libraries by Library Manager and I need to look into javadocs of those libs. So I need to open external browser and find javadoc folder of those libraries again. Would be very useful if javadocs from libraries would be accessible from UI - something similar to Documentation indicies.
You have to add your library to some project. Then the javadoc appears under Documentation indicies.