Button Bar is a new Safari Extension that allows you to create a second Bookmarks bar to store important links. Once installed, the Button Bar is displayed or hidden by toggling the button on the main Safari toolbar. You can add links to the Button Bar by opening Safari Preferences (cmd+,) and selecting the extension preferences.
From the Button Bar preferences, you are also able to customize the look of the Button Bar. By default, the style is in keeping with the Safari interface but there are also 'dark' & 'light' styles, and you are able to specify whether you want the buttons centered, or aligned left or right.
Whilst working on this new extension, I also took the time to update my popular QR Code Generator extension. This has been updated to include similar features: the extension now features a toolbar for generating the QR Codes, and the main toolbar button toggles the status of the QR Code toolbar.
You can still change the Character Encoding of the generated codes from the preferences pane, and I have also added options for changing the overall look of the toolbar: