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I too have found that Toolbar Buttons no longer works in Firefox Developer 55.0b2 (32-bit) since a couple of weeks ago. It and almost all other add-ons now show a "legacy" indicator and most don't work anymore either. I complained to Firefox but nothing has changed.

It seems to still work in regular Firefox 54.0.1 (32-bit) which is great, but the HTML/CSS code Inspector doesn't work as well, which is why I switched to FF Developer.

Any chance that Toolbar Buttons can be fixed?

I can confirm the same problem with Thunderbird 55.0b1 (64-bit)
In firefox 55_b01 64bit icons disappeared.

There are no more icons