There are some Firefox plugins/add-ons out there that simply don't work on versions newer than 3.6.x, and some of those add-ons are necessary to some in order to do their jobs, or to learn at colleges and universities who can't or won't upgrade their software.
For example, my university uses VMWare on its cluster in order to manage all of its VMs. In order to get to the cluster, we have to be running a browser plugin. The catch? This plugin only works with Firefox 3.6.x (or IE 7/8, in which the plugin is so buggy that it's almost unusable).
Is it our fault that the university has not yet upgraded VMWare or tried to receive an updated version of the plugin? No. But it still doesn't change the fact that we have to use what works.
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There are some Firefox plugins/add-ons out there that simply don't work on versions newer than 3.6.x, and some of those add-ons are necessary to some in order to do their jobs, or to learn at colleges and universities who can't or won't upgrade their software. For example, my university uses VMWare on its cluster in order to manage all of its VMs. In order to get to the cluster, we have to be running a browser plugin. The catch? This plugin only works with Firefox 3.6.x (or IE 7/8, in which the plugin is so buggy that it's almost unusable). Is it our fault that the university has not yet upgraded VMWare or tried to receive an updated version of the plugin? No. But it still doesn't change the fact that we have to use what works.