Web Clipper ceased working. I use Firefox. Here is a screencast.
http://screencast-o-matic.com/watch/cDXq2IQef2
I tried to install a new version. It says it is installed. I do not see it on my toolbar.
There are no instructions for Firefox -- only Internet Explorer and Outlook.
https://help.evernote.com/hc/en-us/articles/209004837
I suggest that you provide instructions for Firefox.