Security while surfing on the net is inportant, with firefox you can get more security by using security addons, bellow a list of 10 security and privacy addons.
Liberty Guard add-on protects its users against phishing(fake) websites that look like LibertyReserve.com. This add-on does two things: it notifies you when you are on a real LibertyReserve website and it blocks phishing websites that were reported.
iTrustPage is an anti-phishing tool that Prevents users from filling out suspicious Web forms, and suggests the corresponding legitimate form.
Store login information and fill in forms with a click.
WOT is a free Internet security addon for your browser. It will keep you safe from online scams, identity theft, spyware, spam, viruses and unreliable shopping sites. WOT warns you before you interact with a risky website. It’s easy and it’s free. the addon isavailable for Firefox and Internet explorer.
PasswordMaker manages all your online accounts using either new, uncrackable passwords it creates, or your existing passwords. It even automatically populates webforms for one-click login.
Do you know where your form information is going? This extension displays the form action (the site to which the information you’ve entered is being sent.) In any place where you can enter data, from search boxes to order forms, mouse over the final Submit button to reveal the destination.
FoxyProxy is an advanced proxy management tool that completely replaces Firefox’s limited proxying capabilities. It offers more features than SwitchProxy, ProxyButton, QuickProxy, xyzproxy, ProxyTex, TorButton, etc.
Adds a “private” switch to enable private browsing from the command line.
BetterPrivacy is a Super Cookie Safeguard which protects from usually not deletable LSO’s. It blocks longterm tracking on Google, YouTube Ebay and many other domains.
The best security you can get in a web browser!
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
You can always look for more security addons at this link
Ensure internet safety for kids for their protection.