If you have made the switch from Firefox to Safari for web development (or perhaps you are looking to thoroughly test your website in Safari), and are longing for a way to quickly change browser size, try the following tip:

Open the Safari Bookmark manager (using option + command + b ) and add the following bookmark to the Bookmarks Bar.

To resize the browser window to 1024x768:
Bookmark: 1024x768 Address:

javascript:self.moveTo(0,0);self.resizeTo(1024,768);

To resize the browser window to Fill the Screen:
Bookmark: Fullscreen Address:

 javascript:self.moveTo(0,0);self.resizeTo(screen.availWidth,screen.availHeig ht);