All the apps for FF I installed unto Opera but the self destructing cookies extension I really like as it kills 3rd party cookies by the second.
But the rest of FF extensions such as DONOT TRACK ME and ADBLOCK PLUS is available on Opera...
I was using Firefox for very specific extensions that I use, but I've removed Firefox and I'll look for those extensions/add-on's for Chrome or IE.
I'm not going to support a company that bends over to the gay mafia.