Page:
https://ui.vision/x/download
Wrong link:
https://addons.mozilla.org/en-US/firefox/addon/
Proper one:
https://addons.mozilla.org/en-US/firefox/addon/kantu/
Page:
https://ui.vision/x/download
Wrong link:
https://addons.mozilla.org/en-US/firefox/addon/
Proper one:
https://addons.mozilla.org/en-US/firefox/addon/kantu/
Thanks for the hint! => Fixed