Show File Size In Firefox ‘Open With’ Dialog Box
It can be quite useful and helpful to know the size of a file before downloading it. Unfortunately, if you’re a Firefox fan and use the default download manager, you're out of luck, because Firefox itself does not display the file size when it pops up the ‘Open With’ dialog box. The only information displayed is the file name/type, and you get to choose where the file should go.
Show File Size is a Firefox add-on that enriches the default Open With dialog box, displaying file size with customizable rounding options.
Read More