A reasonable assessment without trying Print Edit WE !!

Looking at all of the reviews, the negative points raised were:

1. Two-stage initiation sequence. Option to skip preparation stage in Print Edit WE 20.0
2. Duplicating original tab may lose some information. Necessary for integrity.
3. Page Breaks shortcut key (#) not working. Fixed in Print Edit WE 20.0.
4. Preview button didn't work. Fixed with Firefox 56.
5. Save As PDF didn't work. Fixed with Firefox 56.
6. Fix Page Breaks command missing. Will be added in next version.
7. Cannot edit Mozilla Add-ons web pages. Mozilla restriction.
8. Permissions. The original Print Edit had greater permissions.

Points 1, 2, 3, 4, 5 & 6 have been fixed. Points 7 & 8 are facts of life.