why Javascript SetTimeout() is not multithreaded

Question

I have a test:

Html:

Empty
Empty

​

js:

var s1 =         


        

Answer 1

Mozilla does support multi-threading in Javascript - as long as you don't want to do UI work from multiple threads. The early versions of my Remove Duplicate Messages (Alternatve) exentsion were multi-threaded.

See my own bug page regarding this issue in my extension, or better still, this page about using worker threads in Mozilla. eicto, you could very well implement your code using a background thread.