The adoption rate for Facebook Browser or even toolbar will be very insignificant. Why?
Majority of Facebook users (35 - 45 yr old females and older) are not the crowd who like to install or capable of installing a new browser or even a new Firefox or Chrome toolbar without the help of GeekSquad or their nerdy nephew.
The other majority are tech users who are already on Firefox or Chrome and the last thing they want is another browser or let Facebook monitor all the websites they are visiting (although this is already happening in some levels)
Majority of Facebook users (35 - 45 yr old females and older) are not the crowd who like to install or capable of installing a new browser or even a new Firefox or Chrome toolbar without the help of GeekSquad or their nerdy nephew.
The other majority are tech users who are already on Firefox or Chrome and the last thing they want is another browser or let Facebook monitor all the websites they are visiting (although this is already happening in some levels)