Works pretty well, but after a few years of using it my list of blocked sites just DISAPPEARED. This is when I was logged in to my FF account as usual. Bizarre.

Fantastic! Does exactly what it says and there's lots more under the hood. A pity it's not compatible with Firefox Mobile.

I want instant close option than minimum 1sec.

I use pages where I read headlines of articles I might click, but some pages are behind walls or I do not like - this is a nice protection. The contra is that a page opens with the restriction info, which I must close then - a 5 seconds blend in info would be more comfortable for me - luxury problem. :-)

It's nice to be able to block sites I don't want from loading, but I wish there was an option to have those sites instantly close, rather than having to wait the 1 second.

ottimo

Not working anymore

Trying to open this feature is more frustrating than trying to block the ad website I want to block.

Seems like it might be useful to some people, but is completely useless for my purposes. It would be much better if there was absolutely no user interface when a blocked site is encountered. I need something that just ignores a URL request to a blocked site.