Same happened to me. Downgraded Firefox on Ubuntu 16:
apt-cache show firefox | grep Version sudo apt install firefox=45.0.2+build1-0ubuntu1 sudo apt-mark hold firefox Next, about:config / xpinstall.signatures.required:=false. Finally, install 0.3.0.xpi from the website. There's an alternative addon that installs without a downgrade. But that one doesn't seem to work. regards, Oleh On Wed, Aug 16, 2017 at 2:58 PM, Marcin Borkowski <mb...@mbork.pl> wrote: > Hi all, > > the title text says it all. Anybody can confirm that? How to configure > capture in FF now? > > TIA, > > -- > Marcin Borkowski >