Rated 5 out of 5 stars

[...]You can also include in the add-on options, e.g. the ability to disable the display of additional information, because not everyone analyzes spam in such detail.

Christian, You're absolutely right. I didn't think it through. :)
I have uploaded the screenshots to GitHub.

Đánh giá này là cho một phiên bản trước của tiện ích (1.2.0). 

Thanks for the positive feedback!

It would be really helpful if you could post a sample header of a mail where the scores were not recognised correctly in a new GitHub issue.
I haven't heard of the scrolling problem yet either. In this case, screenshots of the scrolling problem in another GitHub issue would also be great for solving the problem.
Regarding the add-on options and the possibility of hiding the additional information, I'm not quite sure what exactly should be hidden. The user has to actively press the button in a mail for this information to be displayed at all. I assume that the user then wants to see the actual details and not just the cryptic names of the rules and the score.