Back again, on the Leopard this time and has been interesting dvelopments. Things seem sorted for now at least. I had downloaded the update to FF before but went through all that "haven't got the rights" stuff, i fiddled around with access rights,gave up, turned off, next morning found i now had ability to do update. I don't know what fixed it. Then didn't use computer, tired of the problems,then yesterday it flashed up that an update was waiting so i tried to download and ran into repeat of the no rights issue.
Strangely it seemed there was sometimes 2 Firefoxes, one would open with home page but other kept opening with Mozilla telling me i was running 3.6.28 and would never open with home page.Sometimes there were 2 icons, sometimes one.
The file Info told me i had 3.6.28 but About Firefox told me i had version 3.6.24.
This morning there was a question mark in the dock which said Firefox when put cursor on it, i had trashed a Firefox icon last night. Anyway i recalled the trashed one back again and started to look at both and trashed the question mark, clicked on the remaining FF icon and it opened with my home page and all details show i have the updated version. So i don't know. The test will be when i empty trash and see if it will dump one FF but leave the other one.
Your answers were extremely helpful as to teaching me things so i will have them printed for future reference.
On a different point it took nearly 10 minutes from clicking the link in the email to get signed in to Apple and to be able to write a reply to you, this can't be right? The 10.4 machine ( all eMacs PowerPC) does it much more quickly and yet it is slowish.
The previous owner has installed Microsoft Messenger, Entourage, Power Point, Excel amd MS Word for me, the only other addition is iPhoto which i wanted. Has the computer got too much on it? And which would be the best MS programmes to keep. I don't use them but would like a programme that can open documents that the Mac can't.
Thank you for everything and especially for your patience.