Firefox extension "Link Alert" that knows what file the link destination is
Usage and installation method etc. are as follows.
Click "Install now" for installation from the following.
Link Alert | Firefox Add-ons | Mozilla Corporation
Click "Install Now"
Click "Restart Firefox"
In case of Firefox extension
In case of PDF file
In the case of a ZIP file
To change icon size Go to "Tools" → "Add-ons", select "Link Alert" and click "Settings"
If you check "Use Large Icons" in the lower right corner here, the icon gets bigger. Also, you can also increase the corresponding icon type here.