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Firefox Toolbar

The gadget spec URL could not be found
The gadget spec URL could not be found
Firefox toolbars will only run in Firefox.

IE, Chrome and Safari all have their own way of building toolbars.

Other docs

Guide how to build a Firefox toolbar

Firefox docs

Open links in a new tab

oncommand="Components.classes['@mozilla.org/appshell/window-mediator;1'].getService(Components.interfaces.nsIWindowMediator).getMostRecentWindow('navigator:browser').openUILinkIn('http://www.thegamenet.com/', 'tab');"

More advanced options, like open a tab for a unique url (but refresh the same tab if it is already open)