Update to Latest OS X Upgrade to the latest version of OS X.
If you are upgrading from Lion to Mountain Lion, then tere’s no need to visit a store and fetch a box, and install a bunch of discs. Just click the Mac App Store icon on your Mac. Buy OS X Mountain Lion. And your Mac does the rest.
Follow this Apple guide for more info
Clean System and User Caches etc....
You may need to quickly switch between user-agent strings on the fly - when developing websites that need to work on both mobile browsers and desktop browsers user-agent switcing is a must-have.
And some times you’ll expirence some archaic site blocking you because you’re not using Netscape or Internet Explorer (in an ancient version e.g. version 6).
Chrome got a built-in user-agent switcher. All you need to do is to open the developer tools panel (use Ctrl+Shift+I shortcut) and click the wrench button (lower right corner) and click Overrides, and enable override user agent and elect the browser or device you want to emulate and reload the page....