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About this Add-on
! Attention: If you don't close the Sidebar (in Firefox versions before version 1.5) before you uninstall Webradiobar, you won't be able to close it after uninstalling. That was a bug in Firefox versions before version 1.5, not in Webradiobar (see https://bugzilla.mozilla.org/show_bug.cgi?id=249883 for more details).
Before uninstalling from Firefox versions before version 1.5, close the Sidebar!
Quotation: "If you already did mess it up just reinstall it and close the sidebar and then uninstall it again."