So, in the strictest sense of the question, a safe browser does not exist, because completely safe, and complex enough to be functional are mutually exclusive. In terms of relative safety however, Mozilla Firefox has a lot going for it. There is a responsive security team that works both proactively and reactively to eliminate vulnerabilitieHow to install addons on Mozilla Firefox (PC)?
and select Recommendations . To install a recommended add-on, click the blue + Install Theme or + Add to Firefox button, depending on the type of add-on. At the bottom of the list of recommended add-ons, there's also a Find more add-ons button you can click. It will take you to addons.mozilla.org where you can search for specific add-ons.