This shows how quickly extensions can get developed for Firefox. Requested a Get File Size Extension, much like the one from UNHSolutions and the same day, one was available for download. A new version came out the day after as well. As of version 1.1 (12th March) the following features were part of the extension:
- File Size
- Last Modified Date
- Content type
- HTTP Headers - default disabled, but enabled through extension options
Perhaps more features will be added (if people request them).