Firefox just did an “important!” point release. I wonder if this was why?
I don’t know. I suppose it could be related, but I wouldn’t bet on it solving the basic underlying problem.
The article, as well as several security sites, state that Firefox is not affected.
Firefox is essentially its own little operating system. Everything about it, its cryptographic suite, its execution environment, runs in a sequestered workspace. Further, Mozilla, while recently coming under attack from consumers for "breaking the Internet," has been at the forefront of locking down their browser. The reason why FF can be clunky or inoperable in some ways is due to their methodologies. They are focused on safety over functionality. Its one of the reasons I've stuck with them over the years.