FireFox Crashes in Content/Pages

[Bob]

Greetings all! Thanks again for a great CMS!!!

I'm using CMS Made Simple 1.2.3 on Mac OS 10.4.9, using Firefox (always up-to-date)

Anytime I try to do something as admin in Content/Pages, such as closing up the "children" of a parent page, or activating/de-activating a page, FF will crash with a big warning filling up the screen (if a screen cap would help, I'll provide one later)

Although I get the result I needed (such as de-activating a page) it is a major annoyance having to force quit FF and restart it.

Any ideas?

TIA
Bob