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On install of the extension... remove the progress bar.
Integrated into 'main-golden', available in build *200808021401* on http://bits.netbeans.org/dev/nightly/ Changeset: http://hg.netbeans.org/main/rev/856d69f4cfd5 User: Quy Nguyen <quynguyen@netbeans.org> Log: Install Firefox extensions silently - Fixes Issue #140822
The install dialog has been replaced with an alternate mechanism, which does not have the progress bar.