Last time, I've compiled an article about Bookmarklets for Mac Safari. Actually, those bookmarklets also can be used on your Firefox 3. Because those bookmarklets are running with javascript. As long as you have your javascript turned on, you can use them.
"A bookmarklet is an applet, a small computer application, stored as the URL of a bookmark in a web browser or as a hyperlink on a web page." ~ Wikipedia, the free encyclopedia
It's a bit tricky to store your bookmarklets on Firefox 3 Bookmarks Bar. Simple favicon drag and drop, unfortunately, cannot work in Firefox 3. You still can do simple favicon drag and drop to bookmark a certain page of your visited site. But I don't know why, it just can't work on storing bookmarklets.
Therefore, you need another way to store the bookmarklets on bookmarks bar. I have two alternative ways here and I will explain you the details on how to make it. This is the case if you're willing to read through the article though. You can also watch the short video tutorial at the end of this article.
Above: Safari splitted by two. Done with bookmarklet.
There is a way to quickly run short script in your Safari web browser; It's by using bookmarklets. Bookmarklets are bookmark items and bookmark items are not limited to only url address; We can also make short javascript function as bookmark item by simply dropping the favicon to bookmark bar.