Hello Miss Kitty,

Try refreshing the page.

Note:
Addons don't work on these sites.
i) addon.mozilla.org
ii) about:newtab

Try it on youtube.com, instagram.com or any other site.

If this solves your problem, please give a 5 star rating as your rating will help it reach more people.

If not,

I will solve this issue in 2-3 days (after my exams)
Thanks
Satyam