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Synbol appearing on Firefox Icon on Task bar

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Each time I open Firefox a black symbol appears in the upper right of the Firefox Icon. This began several days ago. What does the symbol mean? See attached image. Is there a way that I can remove this?

Each time I open Firefox a black symbol appears in the upper right of the Firefox Icon. This began several days ago. What does the symbol mean? See attached image. Is there a way that I can remove this?
Attached screenshots

Chosen solution

Hi

I think that this support article should help:

https://support.mozilla.org/en-US/kb/profile-management

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Chosen Solution

Hi

I think that this support article should help:

https://support.mozilla.org/en-US/kb/profile-management

Modified by Paul

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