Your browser does not run web extensions like Vimium / Vimium C on certain pages, usually for security reasons.
Unless your browser's developers change their policy,
then unfortunately it is not possible to make Vimium / Vimium C
(or any other web extension, for that matter) work on this page.
If Vimium C is newly installed, please refresh to get it work.
Configure more on the options page. Version .