I've forwarded this log on to our installer team to see if they've seen this before. If Firefox is now crashing on launch, I'd also recommend doing a disk check to make sure everything is functioning correctly.
We believe you're running into a system problem. The log reports that a required system library is missing, which is definitely not normal.
That's helpful information. In the Trash is the following: #flash.quantserve.com. Also these two folders which are empty: flash.quantserve.com/
What would the system library file or folder be called? Should it normally appear in the Macromedia folder under Preferences? I'm wondering whether it is possible to drag the missing system library back into place and resolve this.
Again, our advice and input is much appreciated.
Solved. Having understood the problem from your reply, I updated the OS software. The videos now play. (I've not yet tried to install the latest version of Flash Player, but I think it will work now.)
That's great news. Glad you were able to get this solved.