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Full user review
"Why Only For Outdated Version of Firefox ?"
Can't think of a Pro for a addon/extension that will only work with an outdated version of Firefox. Current version of Firefox is v3.0.5 and v3.1 is just around the corner. Maybe works good with Firefox 2, but not good enough to down grade Firefox.
Apparently only compatible with outdated version of Firefox.
I know that there are a lot of users still using Firefox 2, but at some point it is time to move on. Maybe the software author will update this addon/extension to work with Firefox 3 in the future. In the meantime, I will continue to use "Tidy Favorites" which is a richly featured bookmark program that is an external program, not an addon or extension, but works seamlessly with Firefox.