Boring 'Download' widget/add on - how can I get rid of him?

I downloaded by mistake one thing little 'trick' who claimed he could help me by uploading videos websites etc. It's THE most irritating thing I've ever had on my computer. He appears in front of every single email that I try to type; hide buttons should I use - it's a small bar that says 'Download' on it - but it is always there where there is NOTHING to download; and on the other hand, it does NOT appear on sites where I could like to download a clip - for example Youtube & BBC iPlayer. It is therefore unnecessary, but I don't see how to get rid of it. I've looked everywhere on my Mac; in "widgets"; 'library', etc - he cannot see anywhere. Someone suggested that it may be something I downloaded in my Firefox browser; but I can't see it on the page 'modules' here either. Does anyone know cela boring thing & how to uninstall?

If it works in safe mode or with all extensions (Tools > Modules > Extensions) off and then try to find out the cause by allowing an extension at a time until the problem reappears.

Close and restart Firefox after each change through "file > exit ' (Mac: ' Firefox > leave";) Linux: "file > exit ')

Tags: Firefox

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