如何在下載之前發現文件大小
許多次，當我們下載文件時，我們不是肯定的大約文件的大小。 只有當下載開始時，我們來知道文件大小。 得到文件大小 是a 自由Internet Explorer添加物 那允許您在下載之前發現文件的大小它。
一次安裝添加物，它將增加項目到用鼠標右鍵單擊菜單。 您需要的所有是用鼠標右鍵單擊在下載鏈接，并且精選得到文件大小。
I wonder how it predicts download time..
When sending header and getting response, it may be able to time response but without downloading the file (or take a predefined speed rate), it is impossible to measure download time, or it could be pretty inaccurate.
For FF user, download statusbar is an option, but it shows information in the status bar while downloading the file.
Well most of us use some kind of Download Manager, but getting file size before starting downloading file looks difficult, No workaround
for FF users 
Search for Firefox addon with name “get file size firefox” in google. I am sure you will found something useful.
Thats a neat add-on for IE but I guess we should get more if we search for it. I believe MS is not marketing IE like Firefox is doing.