Allegedly, on or about 09 May 2016, Doug sent:
I have seen "complaints" about javascript in Firefox for quite some time now. I also see that there are very few if any malware exploits in Linux. So what is the problem?
To summarise it in a nutshell: You don't have to be able to exploit the OS to be able to exploit the person using it.
And there's the problem with pages which, while (perhaps) not directly trying to do something to your computer, are so badly coded that their page causes Firefox to run your CPU at full throttle. Making it near impossible to do anything with your computer.