polyzen [1] filed a deletion request for firefox-multiple-tab-handler [2]: "IMPORTANT SECURITY NOTE: All versions MTH 2.x and MTH 3.x older than MTH 3.0.7 had a data disclosure problem via API for other addons. Sensitive tab information including private window tabs were unintentionally exposed to untrusted addons, regardless they were not have permissions to access those information via WebExtensions API." [1] https://aur.archlinux.org/account/polyzen/ [2] https://aur.archlinux.org/pkgbase/firefox-multiple-tab-handler/