It's fantastic of course, but I just recently lost all my notes because I had to reset windows (no lost files) but this still wiped the notes from the system. Some kind of sync, even to Gdrive or Onedrive would be incredible, it's my fault for not considering they could vanish on me like this... --There isn't an easy way to export notes either-- (Untrue, there is a export to text option I had missed). It's a nice, simple addon, but you have to mind it more than I think most would considering its simplicity. Thank you tho...

[13:55 EEST, 5.5.2019] From TextNotes developer:
Now it works properly for me on my windows 10 again.

[5.5.2019] From TextNotes developer:
There is an error in Firefox why you can not use your TextNotes and you can not download it again.

https://www.theverge.com/2019/5/4/18529456/mozilla-firefox-extensions-bug-certifications-error-fix
https://www.ghacks.net/2019/05/04/your-firefox-extensions-are-all-disabled-thats-a-bug/

Please wait for the fix from Mozilla! It will be ready soon.

Отличное дополнение! Очень удобное и функциональное! Не хватает только возможности использовать различные стили текста (жирность, курсив, подчеркивание и т.д.).

This is a great note taker. However as most of us have seen updates to Firefox can disable addons with incompatibility issues. The export feature in this addon does not produce a readable file so you are on your own if something dies. You will have no backup available unless you can reload the addon. Which is not all bad but a concern none the less. Based on this I could not give it 5 stars and it has not been updated in quite a while, possibility the author has abandoned it. You can't blame the authors for that because they rarely get any remuneration for their efforts. Its worth using but I keep a text file backup and will keep my eyes open for something else.

UPDATE: I have been using this addon for some time now and what I miss most is a search function, especially as I now have more than a dozen notes.
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A very nice and useful add-on! I have used Quicknote in the past but it has become obsolete so I tested several other similar add-ons and I found this one to be the most convenient for me.
My only complain is that those .tn files exported as backup are not readable. I see it has been mentioned again so I hope this functionality becomes available soon!

good but need features to select the text while browsing and through the context menu we can choose to send to an existing note or send to the new note

My 4-star rating is based on how this app delivers its __current__ feature-set, which it does very well.

Having said that, I think the current feature-set is very basic and find myself wishing for a few more niceties. I have started watching the project on GitHub because i like the app a lot and I do hope that it will continue to get some more features
:)