The original preferences toolbar was designed to give the user more control over the pages viewed, and to allow the power browser to use mozilla with greater ease and efficiency than ever before. The PrefBar2 takes this concept to a whole new level; along with the standard preference checkboxes, the new version includes utility buttons, user agent spoofing, web links, and more, served on a fully customizable toolbar with a side of white rice.
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The current version of the PrefBar is 3.0, build 20041224. It should work with Mozilla 1.0 to 1.7.5 and Firefox 1.0+.
The changelog for version 3 is
Changelog 3.0
* Finally fixed Bug 7702 "prefbar broken on Suse 9.x w/Moz 1.7.2/1.7.3" (Manuel Reimer)
* It's now possible to disable the display of PrefBar in Popup windows (Manuel Reimer)
* Rewrote whole rendering Code to make menus possible (Manuel Reimer)
* Overflow Menu for PrefBar (now Buttons not longer disappear) (Manuel Reimer)
* PrefBar Menu (full PrefBar functionality even without Toolbar) (Manuel Reimer)
* Drag and Drop Support in the Preferences Window! (Manuel Reimer)
* The Updater now not longer overwrites your self-defined button labels (Manuel Reimer)
* UserAgent now also gets resettet if you close Mozilla with File->Exit (Manuel Reimer)
* New Preferences Window for Firefox (now I not longer have to manage two preferences systems) (Karsten Düsterloh, Manuel Reimer)
* Reset-Button in Preferences Dialog (Manuel Reimer)
* New Buttons:
o Resize Menulist (Manuel Reimer)
o Clear Cookies (Manuel Reimer)
o Save Page (Manuel Reimer)
* The Buttons "Size 640x480", "Size 800x600" and "Size 1024x768" have been removed as they are replaced with the Resize Menulist (Manuel Reimer)
I have installed PrefBar 3.0 on Mozilla 1.7.5 on two systems running Windows XP. It, so far, seems to work OK. On the one system where it is installed under the profile (instead of under the program directory), the "What's New" button does not seem to work.
A couple of links (among many) to PrefBar threads at SillyDog are
PrefBar 2.3 Final Out
prefbar for Firefox PR 1.0
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041217



3.0 