How to disable breadcrumbs in Eclipse

If you are referring to the breadcrumbs in the help file of a RCP application, there is only a manual way to do it.

Since Ganymede 3.4M5:

• Michael Borgwardt mentions the toolbar icon
• Slava Semushin provides a native shortcut based on Ctrl+3+bread, which points directly to the Toggle Java Editor Breadcrumb option.
• Shachi reminds us below that you can right-click on any icon on the breadcrumb, and select the entry named “Hide Breadcrumb“.

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Original answer (manual way, through key mapping)

Find the file org.eclipse.help.webapp\advanced\breadcrumbs.css and replace its contents with.

.help_breadcrumbs {
   display: none;
}

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For the Java Editor breadcrumb, you need to assign a shortcut to the “Toggle Java Editor Breadcrumb” command (I have tested Alt+B, for instance)

That shortcut will make the breadcrumb bar appear/disappear at will.