I'm extremely confused: the toolbar has been removed but Web Developer tools are still there on Firefox Beta 64.0b8 when I click the hamburger icon and click on Web Developer in the dropdown menu.
And under Web Developer settings, there's still a checkbox to select Screenshots as a tool. I selected it and clicked the hamburger icon again but there was nothing added to the dropdown menu to let me take screenshots, which I managed to do anyway after clicking around some more and somehow being brought to the Firefox Screenshots beta: https://screenshots.firefox.com/
Perhaps as a result of having the Screenshot Beta running in Firefox (I have no idea how, but see at some point I must have joined Firefox Test Pilot - but screenshots are not a current or past experiment there) I can take screenshots by clicking the three dots on the far-right side of the address bar, then clicking the words Take a Screenshot on the dropdown menu found there.
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And under Web Developer settings, there's still a checkbox to select Screenshots as a tool. I selected it and clicked the hamburger icon again but there was nothing added to the dropdown menu to let me take screenshots, which I managed to do anyway after clicking around some more and somehow being brought to the Firefox Screenshots beta: https://screenshots.firefox.com/
Perhaps as a result of having the Screenshot Beta running in Firefox (I have no idea how, but see at some point I must have joined Firefox Test Pilot - but screenshots are not a current or past experiment there) I can take screenshots by clicking the three dots on the far-right side of the address bar, then clicking the words Take a Screenshot on the dropdown menu found there.