Developer no longer supports support
Cool Previews is an effective extension for Mozilla Firefox that lets you preview websites before clicking on the link.
To use it, you only have to hold the cursor for a second, and then place it in the short cool preview icon shown on the right. It opens a small window where you can preview the site. Although you can not browse the full content of the webpage, you can see what it does and you can decide if you want to enter the site.
Cool Preview is a very useful extension for any user. Through it, you can avoid malicious websites before you access them. If you do not have a site then you will know what it says.
Unfortunately, this extension is no longer updated, so it can not work with future versions of Firefox.