Plugins and extensionsthey're what made Photoshop such a bonanza from the late 1980s onward, and they gave it the market push to triumph over competitors who preferred to keep their tools and development completely in-house. It was a great ideamake your own product more valuable by letting other people enhance it for their own benefitand it worked famously. In the graphics world, everyone's got 'em now. But, in the browsing world...well, it takes an open-source project to apply that kind of functionality across categories.
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