That was a smart move by Mozilla making release 24 an extended service release. Avoiding the unnecessary Mochromezilla experience, I'm sticking with (traditional) Firefox 24 ESR for as long as I can.
In Windows, I had the option of stopping the nagging for a particular update. I don't mind modifying scripts or hacking the OS. Please tell me that someone out there knows how to stop the Software Updater from daily asking me to update to the same Firefox release that I do not want, yet still allow me to get the desired system updates.
Without that ability to permanently decline the latest Firefox update, it'll be enough to make me turn off the automatic UBUNTU software update notifications for good.
Thanks for reading.
edit: It turns out that Firefox 25 is OK after all. Mozilla pushed back implementing Australis until next year! http://www.ghacks.net/2013/10/24/firefoxs-australis-design-wont-ship-march-2014/