Appears not to do anything Rated 1 out of 5 stars

Not really sure what this add-on is meant to do -- I thought that it would show a progress bar for POST operations which contain file uploads (form method="post" enctype="multipart/form-data", input type="file") but having just tried this in Firefox 3.6.16 in Win XP, the page progress bar in the status bar remains as dead as it's always been in Firefox -- empty.

The uploads window also failed to show anything.

I don't know whether it's meant to work in RapidShare, but when I uploaded a file to RapidShare a couple of days ago (different PC, also XP, also 3.6.15 or 3.6.16), same thing, no upload progress in the status bar, nothing in the uploads window.

RapidShare took care of progress all by itself, but for sites that don't, this add-on doesn't, either.

This review is for a previous version of the add-on (0.5). 

Hi, this addon is supposed to show the upload progress like its name says. I'm not sure why didn't work in your lousy OS, but I will check it when I got time. I've tried to upload to rapidshare and seems to work just fine, take a look to the screenshot
BTW, did you restart firefox after addon installation? do you have any other addons installed in FF? maybe it's a conflict with another plugin, not sure...