There are other browsers, however: Opera has been around for years and has a faithful following, and although Netscape bit the dust earlier this year, Safari is now available for Windows, too.
A less-known browser that might interest translators is Maxthon. It is offered in two Windows version (1.6, which is more stable, and 2.1, which is niftier), and has a functionality I have not found in any other browser: the possibility to display two different pages side by side.
I am often asked to test localized web pages. Using other browsers I have to switch from one tab to another (or in older browsers such as IE 6, from one instance of the browser to another).
With Maxthon, however, I can display two pages side by side in the same application Window (see for example, this screenshot of Beppe Grillo's blog in English and Italian).

Other uses could be displaying side by side two different online dictionaries or reference sites.
Maxthon is free to download and use (although paying customers get preferential technical assistance), and so far I've found it fast and reliable.
Update
Several commenters have pointed out that there are ways to split the screen in Firefox and other browsers as well. So far I've not been able to find a way to do it in Opera, but in Firefox it is as simple as adding the SplitBrowser add-on (thanks to Torsten).Another browser that offers split screen capability is Avant, which also claims to be "the fastest browser on Earth". I have not, however, tested it, as yet.
