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.

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This newest update disables the ability to zoom the text only.

It does not let you choose font sizes above 28px.

This addon eats up massive memory and crashes firefox.

There are a lot of addons that imply a permanently open sidebar - Tree Style Tab (177k users), Simple Tab Groups (64k users), Sidebery (34k users), Tab Stash (21k users) and a bunch of others that are not related to tabs. In your addon, the "fit-to-window" image scaling mode still doesn't take into account the open sidebar. Your addon scales the image really "fit-to-window", but should scale them "fit-to-content-area-visible".
For all these hundreds of thousands of users, your "fit-to-window" mode is meaningless and useless.