If this was going to happen it would have to be at install and allow the user to choose which one/s they want installed (sort of like picking a language).
If you install all these browsers as default, all that is going to happen is a forum filled with complaints, that would mean making a trip to the software manager clicking remove a whole lot of times, I use one maybe two or three at the very most, anything I don't need gets removed.
If the new user that didn't want a huge list of browsers didn't know how to use a software manager to install them, would not know how to remove them either and seeing a huge list of browsers in their menu, naw, just can't see that working.
The idea of picking and choosing at install sounded good though, saves removing afterwards or installing afterwards.
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