mouse freeze on G4

[retroboy]

My mouse keeps freezing, usually shortly after first powering up, so i have to hold in the power button to restart the machine, it normally works fine after the first stop & restart.
Yesterday however it did it about 4 times, i managed to get to the point where i was connected to the net on each occasion before it froze & restart was required.
Machine is a mirror front G4 running OSX 10.5, recently upgraded from 10.4
Any thoughts anyone

 

[retroboy]

I believe this could be software/browser related.
I have been using Firefox without issue for a few years, but they stopped supporting older Mac OSX sometime last year, they must assume everyone just buys a new machine when one comes out, i'm on OSX10.5.
Anyway, i've been getting messages saying i'm using an out of date version of Firefox & should upgrade, but i can't upgrade unless i have a bang upto date OSX, is it 10.8 now.
My mouse issues with hindsight have coincided with this Firefox update.
So this week i have reverted to using Safari, & upto now no mouse problems.
Can anyone tell me if i can get a version of Firefox that will still work right, or any other browser suggestions, I don't think Google Chrome is supported on my version of OSX. Is there a Safari update i should download.

 

[retroboy]

Revisiting this, the problem quickly returned so is not software related, i've just been muddling through for the last month, i'm looking into the hardware again now.
It could be a dodgy mouse or cable, mouse goes into keyboard so could be glitch there aswell.
So my question would be, do i need to get specifically the same keyboard/mouse combo as i currently have or can i use anything from the apple range, my current OSX is 10.5 does the hardware need to be compatible with that OS.
Insights please before i buy the wrong keyboard & mouse.
thanks