Secondary Browser

I go nuts if I don't get my Firecrack. I go a little cuckoo even if I have to use a stock Firefox.

Maxthon.
IMO Firefox is too slow to be worth running from most pendrives, so I use this quite often.

None. I have no backup browser. I just use Firefox. Why, here is why:

On Windows:

• IE sucks. Any version, it has no decent rendering engine, his addons sucks, too dangerous.
• Safari/Google Chrome are not native. I would like to use them, they both have one of my favorites layout engines, WebKit. But both try to put beauty over nativity, and that is a bad thing in my opinion.
• Opera is not native nor OSS. Opera uses its own style, has its own ways of doing stuff and has its own EULA. I don't like it. It is the best of the alternatives till now though.
• Maxton/any other browser with the rendering engine from IE will suck as much as IE, no matter how many features it has.
• Firefox based browsers, like Kmeleon and Seamonkey are too few and just not ready to come out or not the thing I want to use.

So on Windows if I don't have Firefox I would probably use Opera (or IE to get Portable Firefox ).

On Linux

• Opera on Linux sucks, on webpages the fonts aren't antialiased, it is not native, it has no voice support nothing.
• IEs4Linux is made just for testing webpages by developers (or should be).
• Midori is too unstable (the browser for Linux made with WebKit).
• Konqueror (I can't even spell it) is too overbloated, period.
• Epiphany is the best of these alternatives and it would be my choice of election.

So on Linux if I had no Firefox (what is unlikely) I would go with Epiphany.

On Mac:

• I never had a Mac

So I would go with Safari or Camino if I had no Firefox for Mac.