I fixed proble my self Rated 4 out of 5 stars

Solution: remove (Delete) custom .js ( http://www.ghacks.net/2016/08/14/override-firefox-add-on-signing-requirement/ ) from Firefox which used to override signature verification and open Firefox and install it will install

This user has 2 previous reviews of this add-on.

Rated 1 out of 5 stars

Not available for your platform

Firefox disables this addon due to no signature Rated 2 out of 5 stars

This addon has more Emojis than Emoji Helper and seems to work better than Emoji Helper.

Unfortunately:
12/14/2016
This addon was disabled due to the lack of a
signature. It was working just fine yesterday
12/13/2016.

There does not appear to be a signed update.

This review is for a previous version of the add-on (0.22). 

very buggy Rated 1 out of 5 stars

it is very buggy. crashes firefox, very slow to open. even sometimes doesn't open. uninstalled after first try.

This review is for a previous version of the add-on (0.22). 

Great When Working Rated 3 out of 5 stars

I've always used this extension in Chrome with no issue. I then decided to proceed to using Firefox but the emoji extension automatically closes after opening. I would rate it 5 stars if it worked (due to past experience), as it is a great tool for emoji!

This review is for a previous version of the add-on (0.21). 

Not Working Rated 4 out of 5 stars

Not working, and will not load and re-install after deleting. Please fix, great when working.

This review is for a previous version of the add-on (0.21). 

No Linux? Rated 4 out of 5 stars

Considering I haven't even used it, from my Chrome experiences I love this extension. So I will give it a 4/5 until it's fixed, then I'll write a more updated review on how it compares to their other extensions.

This review is for a previous version of the add-on (0.20). 

Won't install on Firefox Rated 1 out of 5 stars

This is one star for Firefox only. Use this on Chrome & it works great. On Firefox it won't even install.

This review is for a previous version of the add-on (0.15). 

Won't install on Windows XP & 7 Rated 1 out of 5 stars

Same problem as @Thorsten wrote. Extension downloads, but stays on 100% of download progress. Tried to change some options in about:config and checked other extensions like Configuration Mania. Nothing looks wrong and nothing helps.

This review is for a previous version of the add-on (0.14). 

Error messages from browser console Rated 2 out of 5 stars

http://pastebin.com/qee9qZ9m

See previous review for description of error

This review is for a previous version of the add-on (0.14).  This user has a previous review of this add-on.

Finally! Rated 5 out of 5 stars

One of the things I was waiting finally for Firefox! ❤
It's a little bit slow to open the panel, but It looks beautiful.

This review is for a previous version of the add-on (0.14). 

Its awesome! Rated 5 out of 5 stars

The extension is kinda on the heavy side but as a frequent emoji user - its a time and life saver!
A big Thank You to the EmojiOne team. <3

Would be even better if there more lighter and faster!
Keep up the good work!

This review is for a previous version of the add-on (0.13).