It doesn't work anymore in Firefox 138 ...

Слишком большой размер 3,67 МБ

Extension 0.2.7 stopped working in Firefox 133b3

I don't like and I don't trust Yandex as server in Russia.

Extension stopped working in Firefox 129

it's good

It's easy to use and has a wide variety of add-ons to choose from. Whether you want to customize your browser's appearance or enhance its functionality, you can find something here.