>I see the code of Message #1558441 fine, but if I leave it in the screen for about 5 seconds, a text would appear in between some lines of code and remain there until I try to snag it (I used PrtScn to capture) (probably the trigger is not snagit but losing focus)
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>The first image shows the message right after selecting it, the second image shows the message 5 seconds later, this only happens with this particular message.

It is in fact quite weird. Do you have the same thing with other browsers? Do you have the same thing if you close Firefox and restart it? I would also clear all temporary files.