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why does arrow show up on startup as if i downloaded something

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When i start firefox it kinda freezes for a second as if its downloading something, and a grey arrow goes to the download spot, but it doesnt flash green like this (normal download) http://prntscr.com/2sbl1u but rather it just stays grey like this http://prntscr.com/2sbkt2 It may be nothing, but i want to be sure im not uploading anything by mistake.

When i start firefox it kinda freezes for a second as if its downloading something, and a grey arrow goes to the download spot, but it doesnt flash green like this (normal download) http://prntscr.com/2sbl1u but rather it just stays grey like this http://prntscr.com/2sbkt2 It may be nothing, but i want to be sure im not uploading anything by mistake.

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We had another report of this recently. I don't think we found an explanation in that case, but you could take a look: arrow moving after load webpage, malicious software.