What's Similar???

  
IE, Chrome and Firefox all allow multiple-tabbed, multiple-window browsing. All allow tab separation into independent windows.

All three allow Private Browsing, which means visited sites are not listed in your browser's History file. Your ISP knows you've been there, and any cookies you accept on Private Browsing settings do register on your system, and visited site information is available on those cookies, but for casual checks, Private Browsing visitations aren't listed. Most people don't check beyond the History file, so presents or flowers you order online as gifts won't be easily displayed: Your surprise gift search is safe.

All say they allow full user control over cookie placement, but unfortunately, IE and Chrome actually don't.

What's Different???

Chrome developed a unique virus or browser hijacking safety feature. It's called tab buckets. 
Everything you do in a tab stays there. It's like a mini-cache that is emptied when you close the tab. If you have three tabs open in a single window, any hijack attempt in one bucket does not infect your entire window or your computer. If your anti-virus program doesn't pick up the virus or hijack snippet, you're still safe—so long as it's caught by Chrome's programming.

Both IE and Chrome allow back-door cookie placement from paid advertisers and data miners. You may disallow front-door cookie placement via your cookie control panel in Tools – Options – Privacy. However, only Mozilla Firefox actually understands that 'no means no.' If you disallow a cookie, you won't get a cookie placed, just because an advertiser or media firm wants to know where you browse and what types of things you buy online.

Look in your Cookies folder. Compare cookies placed with your cookie-placement instructions and website URL disallowance list. If you use either IE or Chrome, odds are pretty fair that you'll have more cookies on your computer than you thought you did.

Those extra, hidden cookies are what generate a lot of the spam you receive. The more you surf while those cookies are gathering information, the more data that's collected and sold by data miners. Advertisers buy, rent or lease those lists based on your browsing history to send what's called “highly targeted marketing notices.”

Even if you visit a site for research for a paper in school, data miners will know that, and you may find yourself receiving advertiser's emails, simply because you visited an information site on that topic. Yes, it's spam. Yes, it's illegal, but few spammers actually are investigated, charged and fined. That cookie placement of which you don't know might be considered as “implied consent.” You may not have said “yes” to the placement, but because you didn't say “no,” whether you knew about it or not, may give spammers and data miners the green light for unsolicited emails.

Each browser has its unique advantages and disadvantages, but of these top three browsers, only Mozilla Firefox allows you, the user, self-determination on your browsing privacy control.