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* What is a Firefox Theme?
Extensions are installable enhancements to the Mozilla Foundation's projects (and compatible variants such as Portable Firefox), and add features to the application or allow existing features to be modified. Mozilla developers intend Firefox to be a fairly minimal browser in order to reduce software bloat and bugs, while retaining a high degree of extensibility, so that individual users can add the features that they prefer. They are installed via XPInstall modules.