Downgrading to 1.25 solved the issue https://addons.mozilla.org/en-US/firefox/addon/onetab/versions/ https://addons.mozilla.org/firefox/downloads/file/767772/onetab-1.25-fx.xpi
Hi, thank you very much for pointing this out, and sorry for the bug introduced this week. The new version 1.27 will make all of your tabs appear normally again.
