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Thank you for your attention. I have searched on Google but perhaps I'm not searching it right, because I couldn't find a proper answer.
First of all, I'm using Firefox 55.0.3 on Windows 8.1. I don't remember upgrading anything to make this happen. I had some extensions (AdBlock and Video DownloadHelper, installed for a long time and Session Manager, Mega, Session Sync and Spoiler Controller, all installed more recently, but before this started to happen). All of them are deactived now, just as the theme I was using (UNDER THE MIDNIGHT MOON).
Can anyone help me fix this? Thanks