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1. Replaces the native tabbed Suite sidebar with a Firefox style sidebar UI.
2. Provides all the API hooks that Firefox sidebar extensions expect, so making porting these extensions to SeaMonkey as painless as possible. See http://xsidebar.mozdev.org/modified.html for a list of Firefox sidebar extensions ported to SeaMonkey.
3. Provides a compatibity layer with Firefox/toolkit specific widgets to simplify porting general Firefox extensions to SeaMonkey. See http://xsidebar.mozdev.org/modifiedmisc.html for a list of Firefox extensions ported to SeaMonkey.