I praise myself of having a rather complete overview of the browser market. On my main sytem, I've got Opera, Firefox, Seamonkey, Konqueror, and Midori. In virtual machines, I can test Iron or Chromium, as well as IE 8 and Safari, and compare builds of all browsers to each other on various OS. Years ago, I wondered why everybody was using IE. There was no rational reason. People ... just were used to it. Now, I have the feeling that we got the same situation with FF. People use it without even thinking. It's just assumed to be without alternative. Personally, I almost exclusively use Opera. Why? Because Firefox is basically an open-source hypocrite. The Mozilla foundation promised a slim browser already seven years ago. What happened? We got a browser with zero functionality but the memory consumption of three mozillas. They also promised a transparent browser. And look what you got: about:config. 😄 Compare that to the oldfashioned ini files of Opera (and there's always about:opera for converts from FF 😉 ). There is of course one feature of FF which is outstanding: it's add-on system. It's what makes FF unique, and distinguishes it from all other browsers. I would guess that 90% of its current users are not even aware of this feature, which is as much blessing as it's curse. Curse? Oh yes. It's a security concern of gigantic dimensions. Major updates break most add-ons. Many add-ons render the browser sluggish and unresponsive. Playing with add-ons is addictive. 😄 Blessing? Well, without add-ons FF is just as unusable as IE. But with the right add-ons you'll get a browser with impressive value. Let's look at the list of FF add-ons I've installed. I've installed many of them to mimic a function of Opera. Those which aren't are possibly not that terribly important ... but they are fun. 😉 Oh, and one more thing: while Opera does not feature add-ons, it can still be customized to an amazing degree. There are user buttons, user scripts, user styles ... check it out [here.](http://operawiki.info/Opera) Please understand that an NA entry (aka not available) in the table below simply means that _I'm_ not aware of a realization via the above means.

Firefox add-on	Available in Opera?
Adblock Plus	built in (rightclick: block content) [1]
Add to search bar	built in (rightclick on search box)
Better privacy	NA
Cookie button	built in (rightclick: site preferences)
Distrust	NA
Fast Dial	built in (speed Dial)
Fire Gestures	built in (mouse gestures)
Flagfox	NA
Forecastfox	available as widget
Fox!Box!	NA
Linkification	rightclick, go to web address
Long URL Please	NA
No script	built in (rightclick: site preferences)
Secure login	built in (Wand)
SSL blacklist	NA
Stylish	built in (.opera/styles/user)
Torbutton	available as Opera button
Tweak network	built in (preferences)
Undo Closed Tabs Buton	built in (trash can)

[1] A comprehensive [urlfilter.ini](http://www.fanboy.co.nz/adblock/opera/), complete with a css for removing whitespace, and an adblocker realized as a [user script](http://www.adsweep.org/AdSweep.js). Update: What a pity: [Adsweep](http://adsweep.org) has been discontinued.