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I installed Copper on Mozilla version 56.0.1 but it didn't show up any Copper GUI.

Pratyush Agnihotri
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    Your question doesn’t look like related to programming directly, so please use another site for this. For example it’s can be https://serverfault.com/ – Stepan Novikov Oct 24 '17 at 15:31

2 Answers2

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The Copper is not compatible with Mozilla version 56.0.1. I used Mozilla version 55.0.2 and it worked.

Pratyush Agnihotri
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Mozilla doesn't support some addons anymore with new realeses. You can check older version (55.0.0 was working for me). Then, You should unpicked auto-update from settings.

Bozkurthan
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