Or do we? Most of the add-ons, poly fills and plugins that we use have been made by responsible designers and don’t contain anything harmful, the problem is we take this for grated and there are people out there that do write malicious code.
The bottom line is as front end developer we should know what we are putting in to our websites only when we know and understand can we start to fix the problem, I’m not saying everyone should know every coding language inside out but just a quick scan of the file you are adding in to the site should prevent the addition of anything untoward. If after you have done this you are still having problems then it may be wise to look somewhere else for that cool plug in or extension.
Computer Program image comes from Bigstock.com