It keeps launching an error window with “JS Debugger Service is not installed”. This does not appear to be an isolated issue from a Google search, however finding the solution proved a little harder to track down.
There is a thread at the Mozilla Bug Tracking site that sheds light on the problem.
1. You should first ensure you have the latest version of the debugger? (0.9.85, as far as I’m aware) (Available from http://hacksrus.com/~ginda/venkman/)
2. You need in the location bar on the browser enter about:buildconfig and see if –disable-jsd is specified?
Should you see that, you have your problem, the Linux distro has disabled this.
The solution is to download the tar directly from FireFox, however if your OS has previously installed by rpm, as in my case, you have to consider now running a different non rpm version.