Comment 53 for bug 1054282

I really can't believe 12.10 is going to be released with this issue unsolved.

If it's not possible to filter the results then it's absolutely essential that this lens isn't enabled until the user has consciously opted-in. The point is that this isn't someone going to search Amazon, this is someone who's searching their own computer, they shouldn't expect to see results that are not safe for work (or school, or whatever) when they're not explicitly searching a domain where they should expect to find such stuff.

You simply can't expect people to know about this potential issue and disable the feature, you know full well that most people will have no idea about this, and that many will get stung by it (at work, at school, at a client's). Therefore you should absolutely not enable it before getting informed consent from the user. Just ask if people want Amazon results ("which may contain results of an adult nature") at install, or installation of the package for upgrades.