I'm posting here what I've mentioned to the author via email (2015-10-31) because I've received no answer at this time :
I'm running PageZipper on Firefox 42.0 64-BIT (now 44.0) / Windows 7 64-BIT.
With PageZipper 184.108.40.206 active (green icon and overlay on page) if I click a link which will open the destination page in a new tab when I return to the original page (that handled by PageZipper), PageZipper is no longer active (icon no longer green - overlay on page disappeared (logical if PageZipper non-active) - loaded pages remain though (as if I had myself deactivated PageZipper).
This does not happen with PageZipper Version 0.6.2.1-signed which I use consequently for the time being. I have no problems with version 0.6.2.1 except one slight page layout (an extra space at the top) noticed up to now only with encryped.google.com (the only way I call Google except for its news).
I'm bringing this issue because I'd wish to use as always the latest version, here that of PageZipper, but cannot because of above mentioned.
Autopaging, be it as an add-on or as a script with Firefox anyway is on the decline not to mention its heaviness. PageZipper is really a valuable tool for eternal scrolling.
What more to say? My hope for the continuation of PageZipper and of course my thanks for your work. There is no alternative at this time to PageZipper, it is unique!
EDIT : I'm reposting because not only the developer doesn't answer but the comment had been removed.
I repeat, above mentioned occurs occasionally, with the add-on when strangely never with the bookmarklet (which calls the script at the developer's homepage) which means it's related to the add-on's integration to Firefox as an add-on.
The thing is good otherwise, why doesn't the developer answer?