>>166

https://addons.mozilla.org/ja/firefox/addon/tree-style-tab/reviews/
5 段階中 3 の評価
aliwalyd3 によるレビュー (7時間前)
"Important Note: This version contains fatal issue on the startup. There is a workaround: grant an optional permission "Read and modify bookmarks" for this addon via the addons manager UI. The next release will become working without the permission."

you need to fix this issue ASAP.