UPDATE as of 20190313 - and AGAIN other pop up from this extension !
I have now formally requested that Mozilla take action and I very much hope they will soon, - especially when there are SO many great websites to get weather.
(e.g. https://www.timeanddate.com/weather/)

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Oleksandr ..... you've done some fine work with this extension and others you've created, and myself and other users offer you our thanks for doing so.
Now though, IT'S TIME TO PUT AN END TO / STOP YOUR PROMOTIONS PAGE from popping up every so often when it's neither needed nor wanted !
If we users want to see your work record it's easily available from any of the add-on pages for the extensions you've released, and we don't need any other reminders suddenly appearing and stealing focus from what we are doing !
I understand that you were warned previously by Mozilla about your extensions doing this but it seems to be happening again and IT NEEDS TO STOP !
Be advised as well that I am not (nor are other users) interested in your reply (aka your rebuttal) to this complaint, - just STOP the promotions page from ever appearing again (beyond the time of first installation) so we can be done with this and move on - and can continue to enjoy using Firefox - which is probably the best piece of software on the planet !
I sincerely hope this complaint gets resolved this time Oleksandr. I wish you and your family well. Thank you and have a nice day.