By old FF, I meant Firefox Portable 52.9esr which I still have for testing/comparison purposes like this.
I currently use Waterfox as my main browser, but yesterday I was using FF 63 (because I use it for certain things). That's how I found out that the Developer Toolbar was gone. Actually, after the screenshot command wasn't working for me in FF 63 (I was typing it in the Web Console but without : in front), I tried it in Waterfox, and couldn't get it to work there either (because I was using the Web Console by mistake, instead of the Dev Toolbar). Then when I finally figured out my mistake in Waterfox, I went back to FF 63, and was like "Where did the Dev Toolbar go?!"
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I currently use Waterfox as my main browser, but yesterday I was using FF 63 (because I use it for certain things). That's how I found out that the Developer Toolbar was gone. Actually, after the screenshot command wasn't working for me in FF 63 (I was typing it in the Web Console but without : in front), I tried it in Waterfox, and couldn't get it to work there either (because I was using the Web Console by mistake, instead of the Dev Toolbar). Then when I finally figured out my mistake in Waterfox, I went back to FF 63, and was like "Where did the Dev Toolbar go?!"