vimium dont work if i run a file on localhost

[Butek1]

if I run index.html on my PC then Vimium dont work in this index.html

How should a feature do

When a user has done such steps:

https://www.youtube.com/watch?v=t7_1jxUIPbk

then Vimium C should do:

Browser and OS

• Vivaldi 5.4.2753.51 (Stable channel) (Готово обновление 5.5.2805.32) (64 бита)
• Version 6a886b3dacf7a1a5a6d68e6e55f92bc0abaf2aa3
• ОС Windows 10 Version 1909 (Build 18363.657)
• JavaScript V8 10.4.132.24
• Vimium version 1.99.3