content: "While this change is advantageous from a stability and security perspective, it's not without its cost. Current Firefox add-ins can intimately intertwine themselves with the inner workings of the browser using an API called XPCOM. With Electrolysis, that's not easily possible: the add-ins will operate in a separate process from the main Firefox shell, so can no longer wrap themselves around the browser's internals."  Translation -- No more good extensions, but rather chrome-style extensions that can't modify anything core.