Most important add-on/extension ever, anywhere. I avoid all browsers that can't do exactly what this lets Firefox do.

excelente

老眼の人向け。「設定値より小さな文字にしない」という設定が可能。
　文字を小さくするアドオンを探していたので真逆のコンセプトだった。
　最近はサイトによって文字の大きさがバラバラ　で、やたら文字の大きなサイトに度々遭遇する事が多い。また全体的に文字がデカく、10年前は広々と使えたFHD画面が窮屈で最大化しないと収まらなかったりする。そうした状況から文字サイズを縮小し統一するアドオンを探していた。これは大きくするアドオン。

хорошо, но иногда просто не работает

It makes some page abnoraml, for example, images in https://commons.wikimedia.org/ couldn't zoom.

Io

It has a couple of flaws, but overall it's a great add to the browser.

The thing I enjoy,
When I go to an image it is fit to the page. Basically the one thing I use the app for.

The thing I hate,
When I have the browser set to full screen, my navigation bar won't drop down. I have to either press F11 or close firefox completely, which is very frustrating.

I am a photographer and I have the canon 90D, so I work with very high resolution images, all the time. If not mine, its others. Having the images fit to screen is so very convenient...

I know it is this app because all I have to do is disable the app for the full page option to work perfectly and I have my drop down menu....

It drives me nuts...

Works like a charm. I recomend to set autozoom for every new tab.

How to keep the same zoom in "file:///" and all subfolders?

Whenever a page hangs or slow loading it's always this extension that does it.