Mozilla have released the results of a survey conducted in November 2009, where they collected data from 5,054 developers spread across 119 countries, on their development habits.
When it comes to development tools, Eclipse polled high; almost 30% of those polled said they used Eclipse.
Elsewhere, developers praised Firefox for its add-ons. Almost 90% of those surveyed cited using Firefox's add-ons in their Web development efforts.
For full details of the survey's findings, please see the Mozilla blog.