If you ran a survey to every firefox user asking "Would you prefer this Pocket bookmarklet show up by default or not", I'm sure this wouldn't have been a "vocal minority" group. Most people (in terms of ratio) hadn't heard of Pocket and to them it's just a spammy new bookmarklet. Most people are not "vocal" about it because they don't know where to complain. Just because you don't see vocal people doesn't mean it's all fine.