I needed the five major browser icons for a little project I was working on. It turns out that while people have made their own icon sets for most of the browsers, the browser vendors (Mozilla, Apple, Mircosoft, etc) don’t have much out there for people to use.
Luckily, Google Image Search to the rescue. I found, initially small icons from wikipedia. I soon found some other larger-sized versions that scale down better. The browser icons are handy to have, but they should be a lot easier to get a hold of and at a good quality/resolution. The background-color for the icons in the zip are white, but it might only appear that way since they’re all PNG so if you’re lucky, they could be transparent.
You can get the Major Icons Zip file there, all of which are 250px+. Enjoy.