Thus far the primary 'advancements' in Firefox have been an increase in the breaking and displaying of multiple additional email and communications sites such as Yahoo.
Many of us not only do NOT want increased integration, overhead and security hassles of tight integration toe the social network, but will demand an opt in rather than an opt out feature whereby we can LIMIT such integration without FURTHER crippled performance.
With each release, Firefox drops further and further on my list of must have software as it increasingly chases trendy features adored by the tweeting "what is Bieber wearing crowd", than they do in developing a truly useful and functional tool.
In fact, they would do well to make the browser a front for an updated personal/project management utility similar to what InControl was for the Mac in the early 90's - an elegant hyper-linked outliner, planer, database, scheduler, project item (with descrition, lionks, dates, contacts, financial link, etc.) task/finance/contact/notes linked and a user configurable tool able to be configured with different views based upon the application and use. One that will allow one to keep track of any project and to drill down and to view, annotate and keep up with any and all developments in the life of a project - not just some asinine Gant chart suitable for some conceptual meeting.
In all, it seems to continue moving further and further toward the 14 year old market and further from the professional market.