How will you decide which browser security settings to allow and which ones to block?

If the browser security setting is on a website sent from a friend, I always accept the setting.

If the browser security setting has been mentioned on several friends' timelines on Facebook then it must be a good one, so I should do change it on my computer too.

I will need to review each browser security setting and use my best judgement.

If the browser security setting is fesm my favorite online retailers, I will accept it because the retailer knows what I like.