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Custom toolbars disappear upon install, reappear upon uninstall #19
I've been able to trigger this behavior with other add-ons or combinations of add-ons (uMatrix, for example), on different operating systems. What add-ons trigger this behavior seem to vary with the operating system as well. It may be a browser-side issue, but I don't know enough to say for sure yet. I'll keep testing on my end and see what else comes up.