Great! This is the best screen capture for me.

Doesn't work in a private window

Ottimo e semplice da usare. Migliore di qualsiasi altro sistema a me noto per fare degli screenshot.

IT IS THE BEST SCREENSHOT TOOL FOR ME. JUST LOVE THIS.

It is the best screen shot tool. It supports capture a fragment, that is the one that is the most useful to me

Height limited...

This has become one of my favorite tools to easily share snippets of sites.

I can't download the captured file, it's not like as on chrome.

Very nice, especially the "Selected & Scroll" option is very useful and flexible.

Good screenshot taker, but I wish it took screen recordings as Firefox has no Screencastify-like screen recording software.

I don't know what it does to my Firefox, but it takes several minutes till the picture is ready to be stored. So I'm finding another one that hopefully works faster.

Good performance. I am really satisfied.

I've been using this Nimbus Screen Capture for about a month, and so far it does everything I need quickly and easily. My personal favorites are the "Selected and Scroll" capture option,the ability to easily annotate what was captured, and being able to save the resulting file to my computer as well as Dropbox, Google Drive, etc.
There is only one small area for improvement - it's not clear (or wasn't to me, at least) that some annotation options are only available if you use Nimbus Note.
UPDATE: The annotation page is in fact misleading in that it lists Dropbox as a place you can save your captured file when in fact you need the Premium version. That drops my five star rating down to four.

Awesome addon works better than other similar addons of this type.