Not every time, when it happens l have to do what I did in the previous reply, but after the "HTML content omitted… " is gone I can refresh and it works.
I have a fresh update of Firefox (sorry, I not cited it was Firefox) and now when I opened the browser it was ok.
Again, maybe is some of my extensions. anyway I can open after some time. Let’s leave this as it is with me that happens. I will do some tests with the extensdions later…
Looks like it was the NoScript extension. I disabled.