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CloseDeveloper reply by Button Guy
Rated 1 out of 5 stars
Firefox55~55.0.1にてインストールしましたがツールバーにボタンが追加されずカスタマイズからツールバーに配置できるボタン一覧を見てもこのアドオンのボタン自体が存在しません。
This extension is dead, it can't be updated to work in new versions of Firefox with the restrictions the new WebExtension system gives.
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