Internet only works in one browser, what should I do?

Question

Google Chrome

I installed a Yandex browser and have not accessed the Internet through other browsers for a long time. I recently turned on mozilla firefox, but it does not work there. So it is in everyone else - in internet explorer, and in google chrome, and in opera. What to do?
In Yandex browser everything works fine.

Answer 1

It's a pity, I forgot the ball of predictions, it would have helped right away ;(
Alternatively: proxy, network settings (turbo mode on?), And so on and so forth ..

Answer 2

Did you look at the proxy settings?

Answer 3

maybe the add-on is a virus