This is realy weird and we can't reproduce it in our local tests. Icenium Mist does not require the Icenium Chrome extension in order to work and this also does not explain the problem you experience under Firefox.
@Trung: thanks for the FiddlerCap log, unfortunately it does not contain anything that could explain the problem at hand. We see that the version control request have failed due to not being able to load a .js file, which is again caused by the stuck "loading". We would continue to investigate what is wrong.
Thanks for the involvement!
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