How safe is the green padlock?

TLDR; Too many chiefs, not enough cooks. Green padlock with the organization or company name also in green means the website is almost certainly legit, unless you're using Internet Explorer. But Billy, you ask, why is your website only a green padlock? Money. I don't want to spend thousands per year on an EV certificate when a DV will suffice for a personal blog. However, be cautious if your bank does not have EV.