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Ubiquity is a Mozilla Lab product, which is, in fact, slick user interface in the web browser, basically meant for web applications. Until now only the product designers tried to express user's need personalizing each web app for the user. Afterall it was still meant for mass users. Ubiquity provides the platforms where the user can customize the web for himself/herself according to his/her needs. In this case, the user can take benefits of many available web API for various web applications.

Mozilla took a great step, unlike other existing browser, for customization of user's needs by implimeting AddOns to the browser experience. I personally think, this is yet another great step bringing customization to the most potential programmers, who refrained themselves from this attempt. Whoever is familiar with Quicksilver for Mac, can understand what ubiquity is all about. Quicksilver (or perhaps even Spotlight) to Mac is what like Ubiquity for Web.

Ubiquity makes use of trigger, e.g. alt+space, to appear and the user can make use of given command to do the things for which the commands are made, e.g. finding the weather, posting to Twitter, search something on Amazon, or do the calculation, etc. The user doesn't need to go to the website and simply write these commands and well, after entering it you are there with your results. It saves precious amount of time. The following video gives you better idea of how it works:

Ubiquity for Firefox from Aza Raskin on Vimeo.