Bloggers, spending some time on the forums and social networks, probably used to emoticons - small icons used to convey emotional content in a message. Did you miss these icons on your blog posts? With these simple instructions, Firefox Web Browser, GreaseMonkey extension, and special free emoticons script, you will be able to introduce this feature to your Blogger blog.
GreaseMonkey is a specific extension for Firefox which enable you to add hundreds of other scripts to your Firefox. You can download and install it from here. After the extension is installed you can download and install the Emoticons script from here.
Now, when you write your blog post, you are able to add emoticons by simply clicking on them. Note, that this option works in compose mode, not in text/html mode.