I don't know how and why you found this page but in my case, my firefox has trouble auto-installing the plugin. To be precise, it's experiencing strange network problems while downloading (connection to a Google domain like 'r1---sn-bvn0o-fo1l.gvt1.com' always times out when I use a VPN). So, I have to do it manually. At first I searched the internet and found someone experiencing the same problem. I took a look at the guy's solution [...]
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