I think Firefox is creating this situation by doing continuous release wrong... They correctly tried to follow the Chrome model, In order to keep up with a continuously changing world, also shorter release cycles are more efficient.
However, seems to me Firefox doesn't get it. They are still advertising large version # changes. Why do they allow you to download "Firefox 5" instead of just saying this is "Firefox" when you download you get the latest one. Period. With Chrome you have to dig to see a build #, and you will see the press talking Chrome 11, 12, 13. However, you never see Google pushing versions. This results in a situation where IT thinks they are still deploying in cycles instead of installing a constantly updated piece of software. How much time is wasted version branding?
The should also make it so Firefox can be constantly updated via patches, so that IT admins can apply on separate schedule, or behind firewalls.