I just submitted https://kagifeedback.org/d/6176-firefox-extension-option-to-open-a-cached-version-of-kagicom-on-new-tab, and upon choosing the "correct" tags, I found out there were... none appropriate?
So I chose, Appearance and Widget, not sure if they are the best, but anyway.
If a user wants to report a bug or make a suggestion about the Firefox extension, it might be good to have such a tag.
In fact, I'm surprised there are so few tags to choose from.