Overall good. Suggested improvements:
+/- (zoom-in/out) controls displayed on toolbar.
Toolbar button popup should have a button to edit Options.

This extension is good, but I liked the old "Zoom Page" better, but it doesn't work with the current Firefox versions anymore.
There you could set it to automatically select a zoom, which works much better than having to constantly set the zoom size itself.

I wanted to set a default zoom for all sites and this did the trick with no problems. You just have to go to the options in your Add Ons and change it to whatever you want. Thanks!

Awesome for resistFingerprinting users. Thanks for developing this!

It's compact. It works. I love it!

I use the non-WE version on Fx 52.9 ESR for a long time and it is great and a NECESSARY extension for anyone with a wide screen (24") monitor to control gigantic text that claims to be at 100% on many websites which apparently do not code for wide screen monitors. I zoom down to 67% on most websites. I need an extension that will remember my settings for each website and this extension (both non-WE and WE) does a fine job.

I have the WE version 11.4 on Basilisk 2018/07/18 (64bit) and I had a similar problem to HIPUNK's in that I would recently get a popup from Zoom Page whenever starting Basilisk. It said I needed to change a setting in about:config which, like HIPUNK, I had done ages ago. This notice would appear right above the systray as Basilisk was loading. I could NOT click it away!! Closing Basilisk did not remove the notice. Restarting Basilisk did not help. Rebooting the computer (Windows 10 1709-16299.522) did not help as I was now getting that popup from this extension ON BOOT of the computer! ONLY a complete shutdown of the computer (this is a desktop on 24/7) and a later cold boot would remove that message.

I came here in desperation because I cannot be without this extension and I like the WE version which has worked fine on Basilisk until a few weeks ago. I tried your suggestion to HIPUNK and it works!!! I did your suggestion yesterday so I can't be sure it will continue to work but so far, I have not had any popup, that I can't dismiss, about a setting for this extension that I fixed in about:config long ago. So, I will give you 4 stars and 5 later if this fix continues to work.

Great extension for page sizing! Much better than the other one I was using!

Thanks.

Version 11.1, 11.2, 11.3 are not applicable even if default full level is set to 80%.
I am enlarging / reducing the font because I set the default zoom type to text.
Since version 11.0 can fix the default zoom level to 80%, I am using version 11.0.

Add on 09/07/2018.
By setting the contents of the reply it was possible to use the same setting as version 11.0 can be used.

Absolutely perfect in function. So 5/5. However, since roughly Firefox version 59 I get notifications that I need to change some setting in about:config, which I've already done a long long time ago.
That is quite distracting, because it happens roughly once per hour, even with the system warning tone! Please fix this. Until that is fixed I'll give you only 3/5.
Feel free to reply to me if you need additional information like logs or whatever you might need.
EDIT:
Yes, it does. 5/5!

Excellent app.

Would be better if it allowed the ability to adjust both full and text zoom on any given page.

Fonctionne rapidement, l'interface est claire, merci!

I've been using this add-on since Firefox Quantum came out. My problem with it is that I have zoom levels set to increase in 10% increments and the add-on refuses to to respect that setting and keeps defaulting to this behavior eg.: 120%, 133%, 150%, 170%, 200%. What I have the zoom levels set to is: 120%, 130%, 140%, 150%, 160%, 170%, etc.

How can I get this add-on to go up or down in 10% increments?

Much better than what I was using, but every time I sign into Firefox I get the message
“per site zoom mode only fully works if browser zoom site specific is set true....”
Why am I getting it and what do I have to do to stop seeing this message??

I sent an email to the address the developer provided but it bounced back to me as non-existent.