Here are some numbers about browsers used among web developers:
1. Firefox 54.63%
2. Internet Explorer 38.10%
3. Opera 3.84%
4. Safari 1.56%
5. Mozilla 1.34%
Firefox versions:
1. 2.0.0.3 50.74%
2. 2.0.0.4 30.25%
3. 1.5.0.11 6.05%
4. 1.5.0.12 3.65%
5. 2.0.0.2 1.88%
6. 2.0.0.1 1.26%
7. 2.0 1.26%
8. 1.0.7 1.26%
Internet Explorer versions:
1. 6.0 67.27%
2. 7.0 32.65%
BTW: From the latest 15 days, more and more people update their Firefox to 2.0.0.4/1.5.0.12:
1. 2.0.0.4 71.76% (up)
2. 2.0.0.3 11.11%
3. 1.5.0.12 8.10% (up)
4. 2.0.0.2 1.44%