XUL Reference allows you to highlight names of xpcom/xul/xbl components and interfaces in Web pages, then right-click and go straight to its page on xulplanet.com, which is the best xul reference out there. This is more than a search engine plugin because...
Highlander 1.1.1
When you click a link to an URL that's already open in another tab then you'll switch to that tab instead of actually opening the link. However, some sites using heavy javascript may not work correctly with this, so the extension also offers a whitelist...
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