[CentOS] Thunderbird and Firefox

I have two CentOS plus x86_64 workstations that as far as possible I am 
trying to keep the same. One for home, one for my office. I have the 32 
bit Firefox installed along with a number of plugins and have just found 
that firefox no longer plays any shockwave content on my work machine, I 
have tried disabling the various quicktime, mplayer, realplayer plugins 
but still no go. Removed firefox and re-installed (via yumex) still no 
go........
Any other things I can do?

Then on my home machine I have lost the ability to click on a http:// 
link within Thunderbird and have it open the link in Firefox. This works 
fine on the office machine. It is annoying to have to copy and paste the 
link to get it to work.

I have other CentOS machines (x86) where all this works just fine......

Any pointers to get me heading in the right direction?
thanks
Rob
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