You can\u2019t buy this kind of advertising \u2013 literally. However, if you have the right partner, you can land your product on one of the most heavily traveled yet advertising-barren patches of real estate in either the virtual or physical worlds: the Google homepage.That\u2019s where the Firefox browser finds itself is this morning \u2013 and the placement cannot be a pleasant sight for the folks in Redmond. The ad reads: \u201c \u2018Firefox with Google Toolbar,\u2019 tabbed browsing, safer surfing.\u201d (According to one online report, this has previously been visible to some California residents.) Google has long touted its own services in this manner. However, the fact that it would devote such a relatively large display on what has always been a famously Spartan homepage to a campaign that also advances the fortunes of Firefox is another matter altogether. We have spent some time on this blog recently speculating about what it might take for Firefox to graduate from nuisance to genuine business threat for Internet Explorer and Microsoft.Firefox Flicks won\u2019t get it done.A splashy presence on the Google homepage? \u2026 Marketers don\u2019t even let themselves dream about such things.