Плагинец классный нашел.
Создатель плагина BlockSite для Firefox пишет:
"Why was BlockSite created?
I have created this add-on on request for someone in need for a way to control his browsing addiction. After releasing it many years ago, other use cases started to appear, like: parental control, access control in working environments and keeping myself away from addictive websites. Unfortunately, I had to stop developing/maintaining this add-on due to the economic crisis. I just wasn't able to invest any more time into this project for free."
Значит, проблема все-таки есть.
"Why was BlockSite created?
I have created this add-on on request for someone in need for a way to control his browsing addiction. After releasing it many years ago, other use cases started to appear, like: parental control, access control in working environments and keeping myself away from addictive websites. Unfortunately, I had to stop developing/maintaining this add-on due to the economic crisis. I just wasn't able to invest any more time into this project for free."
Значит, проблема все-таки есть.