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The problem being fixes is the progress meter UI will not display when we are dowloading XPI files from the net (see bug report for more details). We were throttling the update of progress bar based on some interval being exceeded. The problem is/was that sometimes the XPI is downloaded faster than the specified interval (a series of these renders the progress bar "dead", and the user has no feedback UI as to what is happening). It is not entirely clear that the time interval computation is correct to being with. The safe thing to do here is to simply let the UI update whenever necko invokes our progress callback, and dispense with the throttling. This results in a smooth UI update and has minimal performance sideaffects (we are limited more by the network I/O and disk writes that the progress bar UI update).