Frustrating. This add-on gets me half the way there, then dumps me.
* The indicator shows e(X)plicit settings, but never indicates that (S)ite-specific settings have been either saved or loaded.
* Site-specific settings are not applied when links from the main domain are launched in new tabs (or any other way).
* There's no wildcard facility for setting up zoom rules. My most common use case is by-passed: I'd like to set a zoom level for the front page of a news site, and a separate zoom level for articles or pages on that domain. Zoom Page sort of pretends to do it, then fails.
* Settings are confusing, filled with weirdly-overlapping options I'll never use, yet lacking fine control over basics.
With the old NoSquint, everything just worked. I used + and - with a couple of modifier keys, and settings were applied consistently and correctly as I browsed. Lacking that consistency, this new add-on is worse than useless. I want to set zoom for the various domains and pages I routinely visit, then stop twiddling. With Zoom Page, that's not possible.
Alas, Mozilla has landed us in this mess. Add-ons that had been honed over years are now being replaced by hastily-concocted 'equivalents.' I'm testing FF 56; but will probably end up reverting to my trusty old 41, where everything still 'just works,' including the many small amenities that make browsing a pleasure instead of chore. (I actually had to post this review from FF 41. I have absolutely no idea why my login failed with 56 - and I have better things to do than figure out yet another thing that's been broken.)
Maybe I'll finally have to try Chrome... at least Google doesn't keep deleting features (Tab Groups), rearranging the UI (Australis) and obliterating their developer support (Quantum).