Yes, it seems it is All In One Sidebar that causes this behaviour, because it happens when NoScript and AIOS are active. AIOS seems completely abandoned on their website and on their GitHub with the versione 57 drop of XUL, so i won't bother you for a solution for a 3 months problem. Thank you very much though for the migration to WebExtension and continuous support. I will donate soon.
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0