Not everyone shares my discombobulation. Rated 1 out of 5 stars

Not everyone shares my discombobulation, I'm sure. Perhaps I can't see the forest for the trees? Maybe it's due to my 45 year umbilical-like attachment to computers.
NOTE: One star only because it was required. Please imagine a 'minus' sign preceding the star. since the egregious waste of time is far too often of little or no concerned to those guilty of it's squander.
I finally got around to trying this add-on, again, with no change in the results.
I got 50 pages of Facebook Help Wanted solicitations.
Windows 7 Ultimate, Firefox 22.0, a long time user of FF and available add-ons, forty-years of daily computer use. Never surprised by technology that comes with a rather time-consuming learning curve. Got used to that, starting with Windows 3.1 all the way up with every subsequent version, to Win 7. THIS is easy. It's hard to replace an operating system but an add-on that doesn't function from the git-go? Click Remove. Move on. Not sure if I HAVE to select at least one star, if so perhaps I can nudge up a minus sign next to it...
I suppose that I have an unspoken moral obligation to provide whatever helpful information I deem relevant however it was touch and go: I cannot believe that my disappointing experience is a singular, unique event, that, at the very minimum, some caveat might have been included to prevent the wasting of so much of my time. That's the insult. You guys own that.

Did the add-on work as you expected it to?
No, it did not.

What features did you like or dislike?
I can only speak for the one feature that I did experience: Facebook needs to hire a professional employment agency to acquire staffing. The 50 duplicate pages scrolling by were hardly an aphrodisiac, even to the millions still unemployed.
This feature was not expected nor appreciated however illustrative of problems encountered when exponential growth encounters a limited and unskilled inventory of available staff.
Was it useful?
Perhaps to Facebook. Perhaps to the Add-On Devs. Depends if they can effect the significant changes to make the product functionally useful to an internet neo-phyte, which I expect is their target market, fug-git-about-it if they're aiming at the more experienced.
Was it easy to use?
Sure. 50 clicks told me all I needed to know.
Will you continue to use this add-on?
No. Too many other Add-Ons that provide quality results to go along with their marketing claims.
This is all the time that I am willing to make available for this dysfunctional offering.
Not interested in any further dialog....

In case one of my current addons somehow conflict with PageZipper I am includings a list:
Cleanest Addon Manager 7.0 (5 Stars here)
Default Full Zoom Level 5.8 (5 Stars here)
Empty Cache Button 2.2 (5 Stars here)
No Small Text 2.1 (5 Stars here)
Scroll to Top/Bottom 0.1.1.2 (5 Stars here)
TableTools2 1.17 (5 Stars here)
TinyURL Generator 2.6.1 (5 Stars here)

Haven't used these enough to rate them:
Bookmark Favicon Changer 1.74
Copy Link URL 1.5
Tab Mix Plus 0.4.1.0