Safety first, surfing with these browser add-ons…

Add-On Firefox Chrome Protects against Configuration
Adblock here here Add serves can be hacked and used to distribute malware. Advertising can redirect you to fraudulent websites. You have to subscribe a filter.
https Everywhere here Protects you from spying and manipulation of the connection. Default configuration works fine.
Flagfox here here Displays a country flag depicting the location of the current website’s server. Default configuration works fine.
KB SSL Enforcer here Protects you from spying and manipulation of the connection. Not as good as “https everywhere” but better than nothing. Mark “Also try the domain with or without www” in the configuration.
Perspectives here here Checks the certificates of ssl connections. Set the security level to “high security”.
RefControl here Don’t show a website from where you came from. Set “Block” don’t send referrer and mark only for other domains.
NoRef here Don’t show a website from where you came from. Default configuration works fine.
NoScript here here Protects you from xss, flash, java script and many other security holes in the web. You have to deactivate NoScript on websites like YouTube and Facebook because they don’t work without scripts. Default configuration works fine.
Ghostery here here Protect your privacy. See who’s tracking your web browsing and block them with Ghostery. blocking trackers by own blacklist