That's a nice theory, but Mozilla's idea of "long term" support is still forcing an upgrade more than once a year just to maintain security patches, and with only a 12-week overlap between a new version starting testing and the complete end of support for the previous version.

That sounds like a long time if you're reading this in Firefox on your home PC, but if you're responsible for a large corporate network with thousands of users and a hundred critical intranet applications to keep working, many of which have a measurable dollar amount attached for every hour of downtime, different rules apply.

There is a reason so many large organisations stuck with IE6 for so long: having tried and tested, stable software is far more valuable in that kind of environment than having the latest shiny features that none of the in-house applications you're actually providing the computers/browsers to use need anyway.